FIND THE BEST PET DOOR SIZE FOR MY PET

Where To Install:
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inchesPlease fill the above fields.
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Door
Ideal Pet Products
5-32
15
Super Large
https://www.petdoors.com/products/ideal-designer?variant=33932746129546
-
Door
Ideal Pet Products
5-17
7
Medium
https://www.petdoors.com/products/ideal-designer?variant=33932746031242
-
Door
Ideal Pet Products
5-23
10.5
Extra Large
https://www.petdoors.com/products/ideal-designer?variant=33932746064010
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Window
Patio Pacific
6-12
5.1
Small
https://www.petdoors.com/products/custom-sash-with-petsafe
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Window
Liberty Pet Door
9-16
5
Small
https://www.petdoors.com/products/liberty-custom-window?variant=44750660370667
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Window
Liberty Pet Door
9-22
7
Medium
https://www.petdoors.com/products/liberty-custom-window?variant=44750660403435
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Window
Liberty Pet Door
9-28
9
Large
https://www.petdoors.com/products/liberty-custom-window?variant=44750660436203
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Window
Patio Pacific
6-12
5.1
Small
https://www.petdoors.com/products/sash-with-petsafe
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Window
Patio Pacific
6-11
5.1
Small
https://www.petdoors.com/products/window-with-petsafe
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Screen Door
Ideal Pet Products
8-16
8.75
Original
https://www.petdoors.com/products/ideal-screen-fit-pet
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Sliding Glass Door
Pet Door Products
9-15
6
Small
https://www.petdoors.com/products/pet-door-products-glass?variant=40494219526309
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Sliding Glass Door
Pet Door Products
9-21
8
Medium
https://www.petdoors.com/products/pet-door-products-glass?variant=40494219591845
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Sliding Glass Door
Pet Door Products
9-27
10
Large
https://www.petdoors.com/products/pet-door-products-glass?variant=40494219657381
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Sliding Glass Door
Pet Door Products
9-34
12
Extra Large
https://www.petdoors.com/products/pet-door-products-glass?variant=40494219722917
-
Door
Ideal Pet Products
4-9
6.25
Cat Flap
https://www.petdoors.com/products/ideal-4-way?variant=33932148408458
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Door
Ideal Pet Products
4-16
7.5
Large Cat Flap
https://www.petdoors.com/products/ideal-4-way?variant=33932718538890
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Wall
High Tech Pet Products
12-19
6.38
Small
https://www.petdoors.com/products/high-tech-armor-flex-wall?variant=40271628009637
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Wall
High Tech Pet Products
12-25
8.25
Medium
https://www.petdoors.com/products/high-tech-armor-flex-wall?variant=40271628042405
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Wall
High Tech Pet Products
12-31
10.5
Large
https://www.petdoors.com/products/high-tech-armor-flex-wall?variant=40271628075173
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Wall
High Tech Pet Products
12-38
12.5
Extra Large
https://www.petdoors.com/products/high-tech-armor-flex-wall?variant=40271628107941
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Door
PetSafe Pet Doors
6-12
7.125
Original
https://www.petdoors.com/products/petsafe-4-way
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Wall
Endura Flap
8-16
6
Small
https://www.petdoors.com/products/endura-flap-thick?variant=43536060088555
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Wall
Endura Flap
8-22
11.25
Medium
https://www.petdoors.com/products/endura-flap-thick?variant=43536060154091
-
Wall
Endura Flap
8-28
10
Large
https://www.petdoors.com/products/endura-flap-thick?variant=43536060219627
-
Wall
Endura Flap
8-36
12
Extra Large
https://www.petdoors.com/products/endura-flap-thick?variant=43536060285163
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Window
Whiskers and Windows
4-10
7
Original
https://www.petdoors.com/products/whiskers-custom-sash?variant=44692582269163
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Window
Whiskers and Windows
4-10
7
Original
https://www.petdoors.com/products/whiskers-window?variant=44661188460779
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Door
Utah Pet Access
8-22
8
Medium
https://www.petdoors.com/products/utah-pet-access?variant=43698146181355
-
Door
Utah Pet Access
8-28
10
Large
https://www.petdoors.com/products/utah-pet-access?variant=43698146115819
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Door
Utah Pet Access
8-36
12
Extra Large
https://www.petdoors.com/products/utah-pet-access?variant=43698146050283
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Window
Whiskers and Windows
4-10
7
Original
https://www.petdoors.com/products/whiskers-sash?variant=44692581122283
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Door
PetSafe Pet Doors
4-8
5.91
Cat Door
https://www.petdoors.com/products/petsafe-microchip
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Door
High Tech Pet Products
12-19
6.38
Small
https://www.petdoors.com/products/high-tech-armor-flex?variant=40271608742053
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Door
High Tech Pet Products
12-25
8.25
Medium
https://www.petdoors.com/products/high-tech-armor-flex?variant=40271608774821
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Door
High Tech Pet Products
12-31
10.5
Large
https://www.petdoors.com/products/high-tech-armor-flex?variant=40271608807589
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Door
High Tech Pet Products
12-38
12.5
Extra Large
https://www.petdoors.com/products/high-tech-armor-flex?variant=40271608840357
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Sliding Glass Door
Whiskers and Windows
4-12
7
Original
https://www.petdoors.com/products/whiskers-custom-slider?variant=46030382498027
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Sliding Glass Door
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122357483
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Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122357483
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Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122357483
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Sliding Glass Door
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122357483
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Wall
Endura Flap
9-16
6
Small
https://www.petdoors.com/products/endura-flap-cat-wall?variant=33932151816330
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Sliding Glass Door
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-thermo?variant=40784617537701
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Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-thermo?variant=35762721194149
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Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/endura-flap-thermo?variant=35762721489061
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Sliding Glass Door
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/endura-flap-thermo?variant=35762721849509
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Sliding Glass Door
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-thermo-cat?variant=40494226440357
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Sliding Glass Door
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/dual-panel-thermo-panel?variant=43405595902187
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Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/dual-panel-thermo-panel?variant=43405596197099
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Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/dual-panel-thermo-panel?variant=43405596492011
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Sliding Glass Door
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/dual-panel-thermo-panel?variant=43405596786923
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Window
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-window-cat?variant=35762599559333
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Door
Endura Flap
9-16
6
Small
https://www.petdoors.com/products/endura-flap-cat-door?variant=33932147261578
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Door
Cat Mate/Dog Mate Pet Doors
5-10
7
221 Deluxe
https://www.petdoors.com/products/catmate-door?variant=44709847367915
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Door
Cat Mate/Dog Mate Pet Doors
8-22
11.75
Large
https://www.petdoors.com/products/dogmate-215-216?variant=33932715720842
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Door
Cat Mate/Dog Mate Pet Doors
4-9
5.75
Original
https://www.petdoors.com/products/catmate-electronic
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Door
Cat Mate/Dog Mate Pet Doors
4-9
6
Original
https://www.petdoors.com/products/catmate-elite-355?variant=33932697370762
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Wall
Cat Mate/Dog Mate Pet Doors
4-9
5.75
Original
https://www.petdoors.com/products/catmate-microchip
-
Wall
Cat Mate/Dog Mate Pet Doors
4-9
5.75
Orignal
https://www.petdoors.com/products/catmate-wall?variant=33932149260426
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Sliding Glass Door
Whiskers and Windows
4-10
7
Cat Flap
https://www.petdoors.com/products/whiskers-window-slider-cat-door?variant=34579451609253
-
Window
Whiskers and Windows
4-10
7
Cat Flap
https://www.petdoors.com/products/whiskers-windows-sliding-window?variant=35762832638117
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Door
Hale Pet Door
5-14
6.5
Small Medium
https://www.petdoors.com/products/hale-door?variant=33932752846986
-
Door
Hale Pet Door
5-19
8.5
Medium
https://www.petdoors.com/products/hale-door?variant=33932753076362
-
Door
Hale Pet Door
5-23
8.5
Tall Medium
https://www.petdoors.com/products/hale-door?variant=33932753404042
-
Door
Hale Pet Door
5-24
11
Large
https://www.petdoors.com/products/hale-door?variant=33932753698954
-
Door
Hale Pet Door
5-29
11
Tall Large
https://www.petdoors.com/products/hale-door?variant=33932753961098
-
Door
Hale Pet Door
5-31
14
Extra Large
https://www.petdoors.com/products/hale-door?variant=33932754944138
-
Door
Hale Pet Door
5-34
11
Tall Large Plus
https://www.petdoors.com/products/hale-door?variant=33932754223242
-
Door
Hale Pet Door
5-36
14
Extra Large Plus
https://www.petdoors.com/products/hale-door?variant=33932755239050
-
Door
Hale Pet Door
5-42
11
Extra Tall Large
https://www.petdoors.com/products/hale-door?variant=33932754485386
-
Door
Hale Pet Door
5-44
15.5
Giant
https://www.petdoors.com/products/hale-door?variant=33932755501194
-
Screen Door
Hale Pet Door
5-14
6.5
Small Medium
https://www.petdoors.com/products/hale-screen?variant=33932714180746
-
Screen Door
Hale Pet Door
5-19
8.5
Medium
https://www.petdoors.com/products/hale-screen?variant=33932714377354
-
Screen Door
Hale Pet Door
5-23
8.5
Tall Medium
https://www.petdoors.com/products/hale-screen?variant=33932714475658
-
Screen Door
Hale Pet Door
5-24
11
Large
https://www.petdoors.com/products/hale-screen?variant=33932714573962
-
Screen Door
Hale Pet Door
5-29
11
Tall Large
https://www.petdoors.com/products/hale-screen?variant=33932714672266
-
Screen Door
Hale Pet Door
5-31
14
Extra Large
https://www.petdoors.com/products/hale-screen?variant=33932714967178
-
Screen Door
Hale Pet Door
5-34
11
Tall Large Plus
https://www.petdoors.com/products/hale-screen?variant=33932714770570
-
Screen Door
Hale Pet Door
5-36
14
Extra Large Plus
https://www.petdoors.com/products/hale-screen?variant=33932715065482
-
Screen Door
Hale Pet Door
5-42
11
Extra Tall Large
https://www.petdoors.com/products/hale-screen?variant=33932714868874
-
Screen Door
Hale Pet Door
5-44
15.5
Giant
https://www.petdoors.com/products/hale-screen?variant=33932715163786
-
Sliding Glass Door
Hale Pet Door
5-14
6.5
Small Medium
https://www.petdoors.com/products/hale-through-the-glass?variant=43846747947243
-
Sliding Glass Door
Hale Pet Door
5-19
8.5
Medium
https://www.petdoors.com/products/hale-through-the-glass?variant=43846747980011
-
Sliding Glass Door
Hale Pet Door
5-23
8.5
Tall Medium
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748012779
-
Sliding Glass Door
Hale Pet Door
5-24
11
Large
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748045547
-
Sliding Glass Door
Hale Pet Door
5-29
11
Tall Large
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748078315
-
Sliding Glass Door
Hale Pet Door
5-31
14
Extra Large
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748176619
-
Sliding Glass Door
Hale Pet Door
5-34
11
Tall Large Plus
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748111083
-
Sliding Glass Door
Hale Pet Door
5-36
14
Extra Large Plus
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748209387
-
Sliding Glass Door
Hale Pet Door
5-42
11
Extra Tall Large
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748143851
-
Sliding Glass Door
Hale Pet Door
5-44
15.5
Giant
https://www.petdoors.com/products/hale-through-the-glass?variant=43846748242155
-
Wall
Hale Pet Door
5-14
6.5
Small Medium
https://www.petdoors.com/products/hale-wall?variant=33932739084426
-
Wall
Hale Pet Door
5-19
8.5
Medium
https://www.petdoors.com/products/hale-wall?variant=33932739379338
-
Wall
Hale Pet Door
5-23
8.5
Tall Medium
https://www.petdoors.com/products/hale-wall?variant=33932739641482
-
Wall
Hale Pet Door
5-24
11
Large
https://www.petdoors.com/products/hale-wall?variant=33932739936394
-
Wall
Hale Pet Door
5-29
11
Tall Large
https://www.petdoors.com/products/hale-wall?variant=33932740264074
-
Wall
Hale Pet Door
5-31
14
Extra Large
https://www.petdoors.com/products/hale-wall?variant=33932741836938
-
Wall
Hale Pet Door
5-34
11
Tall Large Plus
https://www.petdoors.com/products/hale-wall?variant=33932740526218
-
Wall
Hale Pet Door
5-36
14
Extra Large Plus
https://www.petdoors.com/products/hale-wall?variant=33932741378186
-
Wall
Hale Pet Door
5-42
11
Extra Tall Large
https://www.petdoors.com/products/hale-wall?variant=33932740853898
-
Wall
Hale Pet Door
5-44
15.5
Giant
https://www.petdoors.com/products/hale-wall?variant=33932741673098
-
Wall
Hale Pet Door
5-14
6.5
Small Medium
https://www.petdoors.com/products/hale-thick-wall?variant=34614321741989
-
Wall
Hale Pet Door
5-19
8.5
Medium
https://www.petdoors.com/products/hale-thick-wall?variant=34614321971365
-
Wall
Hale Pet Door
5-23
8.5
Tall Medium
https://www.petdoors.com/products/hale-thick-wall?variant=34614322233509
-
Wall
Hale Pet Door
5-24
11
Large
https://www.petdoors.com/products/hale-thick-wall?variant=34614322495653
-
Wall
Hale Pet Door
5-29
11
Tall Large
https://www.petdoors.com/products/hale-thick-wall?variant=34614322757797
-
Wall
Hale Pet Door
5-31
14
Extra Large
https://www.petdoors.com/products/hale-thick-wall?variant=34614324363429
-
Wall
Hale Pet Door
5-34
11
Tall Large Plus
https://www.petdoors.com/products/hale-thick-wall?variant=34614323019941
-
Wall
Hale Pet Door
5-36
14
Extra Large Plus
https://www.petdoors.com/products/hale-thick-wall?variant=34614323773605
-
Wall
Hale Pet Door
5-42
11
Extra Tall Large
https://www.petdoors.com/products/hale-thick-wall?variant=34614323282085
-
Wall
Hale Pet Door
5-44
15.5
Giant
https://www.petdoors.com/products/hale-thick-wall?variant=34614324035749
-
Door
Endura Flap
9 - 16
6
Small
https://www.petdoors.com/products/endura-flap?variant=43303666614507
-
Door
Endura Flap
9-22
8
Medium
https://www.petdoors.com/products/endura-flap?variant=43303666680043
-
Door
Endura Flap
9-28
10
Large
https://www.petdoors.com/products/endura-flap?variant=43303666745579
-
Door
Endura Flap
9-36
12
Extra-Large
https://www.petdoors.com/products/endura-flap?variant=43303666811115
-
Sliding Glass Door
Endura Flap
8-14
6
Small
https://www.petdoors.com/products/endura-flap-severe-weather-vinyl-slider?variant=34579451838629
-
Sliding Glass Door
Endura Flap
8-21
8
Medium
https://www.petdoors.com/products/endura-flap-severe-weather-vinyl-slider?variant=34579451936933
-
Sliding Glass Door
Endura Flap
8-31
10
Large
https://www.petdoors.com/products/endura-flap-severe-weather-vinyl-slider?variant=34579452035237
-
Sliding Glass Door
Endura Flap
8-36
12
Extra-Large
https://www.petdoors.com/products/endura-flap-severe-weather-vinyl-slider?variant=34579452133541
-
Sliding Glass Door
Endura Flap
9 - 15
6
Small
https://www.petdoors.com/products/endura-flap-severe-weather?variant=34579451838629
-
Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-thermo-panel-3e?variant=35762721194149
-
Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/endura-flap-thermo-panel-3e?variant=35762721489061
-
Sliding Glass Door
Endura Flap
9-34
12
Extra-Large
https://www.petdoors.com/products/endura-flap-thermo-panel-3e?variant=35762721849509
-
Sliding Glass Door
Endura Flap
9 - 14
6
Small
https://www.petdoors.com/products/endura-flap-vinyl-slider?variant=40494217953445
-
Sliding Glass Door
Endura Flap
9 - 21
8
Medium
https://www.petdoors.com/products/endura-flap-vinyl-slider?variant=40494217986213
-
Sliding Glass Door
Endura Flap
9 - 32
10
Large
https://www.petdoors.com/products/endura-flap-vinyl-slider?variant=40494218018981
-
Sliding Glass Door
Endura Flap
9 - 38
12
Extra-Large
https://www.petdoors.com/products/endura-flap-vinyl-slider?variant=40494218084517
-
Sliding Glass Door
Endura Flap
9 - 15
6
Small
https://www.petdoors.com/products/endura-flap-cat-slider?variant=44116296827115
-
Wall
Endura Flap
9 - 16
6
Small
https://www.petdoors.com/products/endura-flap-wall?variant=42880416579819
-
Wall
Endura Flap
9 - 22
8
Medium
https://www.petdoors.com/products/endura-flap-wall?variant=42880416645355
-
Wall
Endura Flap
9 - 28
10
Large
https://www.petdoors.com/products/endura-flap-wall?variant=42880416710891
-
Wall
Endura Flap
9 - 36
12
Extra-Large
https://www.petdoors.com/products/endura-flap-wall?variant=42880416776427
-
Wall
Endura Flap
9 - 16
6
Small
https://www.petdoors.com/products/endura-flap-cat-doors-for-walls?variant=33932151816330
-
Window
Endura Flap
9 - 15
6
Small
https://www.petdoors.com/products/endura-flap-cat-door-horizontal-window?variant=35762599559333
-
Window
Endura Flap
9 - 15
6
Small
https://www.petdoors.com/products/thermo-sash-3e-cat-door?variant=33932683280522
-
Window
Endura Flap
9 - 15
6
Small
https://www.petdoors.com/products/thermo-sash-window?variant=34579267846309
-
Window
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/thermo-sash-window?variant=44241129308395
-
Window
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/thermo-sash-window?variant=44241129996523
-
Window
Endura Flap
9 - 34
12
Extra-Large
https://www.petdoors.com/products/thermo-sash-window?variant=44241131307243
-
Door
High Tech Pet Products
8- 15
8.25
Medium
https://www.petdoors.com/products/high-tech-door?variant=44095119294699
-
Door
High Tech Pet Products
8-24
12.25
Large
https://www.petdoors.com/products/high-tech-door?variant=44095119327467
-
Door
High Tech Pet Products
12-19
6.38
Small
https://www.petdoors.com/products/high-tech-armor-flex-for-doors?variant=40271608742053
-
Door
High Tech Pet Products
12-25
8.25
Medium
https://www.petdoors.com/products/high-tech-armor-flex-for-doors?variant=40271608774821
-
Door
High Tech Pet Products
12-31
10.5
Large
https://www.petdoors.com/products/high-tech-armor-flex-for-doors?variant=40271608807589
-
Door
High Tech Pet Products
12-38
12.5
Extra-Large
https://www.petdoors.com/products/high-tech-armor-flex-for-doors?variant=40271608840357
-
Sliding Glass Door
High Tech Pet Products
8-14
8.25
Medium
https://www.petdoors.com/products/high-tech-slider?variant=44095118377195
-
Sliding Glass Door
High Tech Pet Products
8-23
12.25
Large
https://www.petdoors.com/products/high-tech-slider?variant=44095118442731
-
Wall
High Tech Pet Products
8-15
8.25
Medium
https://www.petdoors.com/products/high-tech-wall?variant=44095119556843
-
Wall
High Tech Pet Products
8-24
12.25
Large
https://www.petdoors.com/products/high-tech-wall?variant=44095119589611
-
Door
Ideal Pet Products
7-13
5
Small
https://www.petdoors.com/products/ideal-ruff-weather-door?variant=33932148277386
-
Door
Ideal Pet Products
7-19
7.25
Medium
https://www.petdoors.com/products/ideal-ruff-weather-door?variant=33932749570186
-
Door
Ideal Pet Products
7-26
9.75
Extra Large
https://www.petdoors.com/products/ideal-ruff-weather-door?variant=33932749602954
-
Door
Ideal Pet Products
7-36
15
Super Large
https://www.petdoors.com/products/ideal-ruff-weather-door?variant=33932749635722
-
Door
Ideal Pet Products
5-17
7
Medium
https://www.petdoors.com/products/ideal-deluxe-door?variant=33932746686602
-
Door
Ideal Pet Products
5-23
10.5
Extra Large
https://www.petdoors.com/products/ideal-deluxe-door?variant=33932746752138
-
Door
Ideal Pet Products
5-32
15
Super Large
https://www.petdoors.com/products/ideal-deluxe-door?variant=33932746817674
-
Door
Ideal Pet Products
5-10
5
Small
https://www.petdoors.com/products/ideal-designer-series-original
-
Door
Ideal Pet Products
5-17
7
Medium
https://www.petdoors.com/products/ideal-designer-series-original?variant=33932746031242
-
Door
Ideal Pet Products
5-23
10.5
Extra Large
https://www.petdoors.com/products/ideal-designer-series-original?variant=33932746064010
-
Door
Ideal Pet Products
5-32
15
Super Large
https://www.petdoors.com/products/ideal-designer-series-original?variant=33932746129546
-
Door
Ideal Pet Products
9-17
6.625
Medium
https://www.petdoors.com/products/ideal-ultra-flex?variant=43741630628075
-
Door
Ideal Pet Products
9-24
10.25
Large / Extra Large
https://www.petdoors.com/products/ideal-ultra-flex?variant=44240012476651
-
Door
Ideal Pet Products
4-9
6.25
Original
https://www.petdoors.com/products/ideal-4-way-locking-cat-door?variant=33932148408458
-
Door
Ideal Pet Products
4-16
7.5
Large
https://www.petdoors.com/products/ideal-4-way-locking-cat-door?variant=33932718538890
-
Screen Door
Ideal Pet Products
9-17
7
Medium
https://www.petdoors.com/products/ideal-screen-guard?variant=33932155879562
-
Screen Door
Ideal Pet Products
9-23
10.5
Extra Large
https://www.petdoors.com/products/ideal-screen-guard?variant=33932697075850
-
Screen Door
Ideal Pet Products
8-16
8.75
Original
https://www.petdoors.com/products/ideal-screen-fit-pet-door
-
Screen Door
Ideal Pet Products
12-20
7.25
Original
https://www.petdoors.com/products/ideal-passage-screen
-
Sliding Glass Door
Ideal Pet Products
5-9
5
Chubby Kat
https://www.petdoors.com/products/ideal-fast-fit?variant=40494256783525
-
Sliding Glass Door
Ideal Pet Products
5-16
7
Medium
https://www.petdoors.com/products/ideal-fast-fit?variant=44100867424491
-
Sliding Glass Door
Ideal Pet Products
5-22
10.5
Extra Large
https://www.petdoors.com/products/ideal-fast-fit?variant=44100867358955
-
Sliding Glass Door
Ideal Pet Products
5-30
15
Super Large
https://www.petdoors.com/products/ideal-fast-fit?variant=44100867653867
-
Wall
Ideal Pet Products
7-13
5
Small
https://www.petdoors.com/products/ideal-ruff-weather-wall?variant=33932152242314
-
Wall
Ideal Pet Products
7-19
7.25
Medium
https://www.petdoors.com/products/ideal-ruff-weather-wall?variant=33932694913162
-
Wall
Ideal Pet Products
7-26
9.75
Extra Large
https://www.petdoors.com/products/ideal-ruff-weather-wall?variant=33932694945930
-
Wall
Ideal Pet Products
7-36
15
Super Large
https://www.petdoors.com/products/ideal-ruff-weather-wall?variant=33932694978698
-
Screen Door
RCR Screens
8-14
8
Original
https://www.petdoors.com/products/rcr-easy-screen-cat
-
Sliding Glass Door
Whiskers and Windows
4-10
7
Cat Flap
https://www.petdoors.com/products/custom-whiskers-windows-panel?variant=43543115399403
-
Sliding Glass Door
Endura Flap
8-14
6
Small
https://www.petdoors.com/products/custom-endura-flap-severe-weather-vinyl?variant=43611180138731
-
Sliding Glass Door
Endura Flap
8-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-severe?variant=44239908667627
-
Sliding Glass Door
Endura Flap
8-27
10
Large
https://www.petdoors.com/products/endura-flap-custom-severe?variant=44239908700395
-
Sliding Glass Door
Endura Flap
8-34
12
Extra-Large
https://www.petdoors.com/products/endura-flap-custom-severe?variant=44239908733163
-
Wall
Ideal Pet Products
7-19
7.25
Medium
https://www.petdoors.com/products/ideal-plastic-wall-mount?variant=43837313745131
-
Wall
Ideal Pet Products
7-26
9.75
Extra-Large
https://www.petdoors.com/products/ideal-plastic-wall-mount?variant=43837313777899
-
Door
Liberty Pet Door
9-16
6
Small
https://www.petdoors.com/products/liberty-door?variant=44424072986859
-
Door
Liberty Pet Door
9-22
8
Medium
https://www.petdoors.com/products/liberty-door?variant=44424073216235
-
Door
Liberty Pet Door
9-28
10
Large
https://www.petdoors.com/products/liberty-door?variant=44424073412843
-
Door
Liberty Pet Door
9-36
12
Extra Large
https://www.petdoors.com/products/liberty-door?variant=44432515465451
-
Wall
Liberty Pet Door
9-16
6
Small
https://www.petdoors.com/products/liberty-wall?variant=44424284274923
-
Wall
Liberty Pet Door
9-22
8
Medium
https://www.petdoors.com/products/liberty-wall?variant=44424284471531
-
Wall
Liberty Pet Door
9-28
10
Large
https://www.petdoors.com/products/liberty-wall?variant=44424284668139
-
Wall
Liberty Pet Door
9-36
12
Extra Large
https://www.petdoors.com/products/liberty-wall?variant=44432516055275
-
Sliding Glass Door
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-custom-thermo?variant=40494215823525
-
Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-thermo?variant=40494215921829
-
Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/endura-flap-custom-thermo?variant=40494216020133
-
Sliding Glass Door
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/endura-flap-custom-thermo?variant=40494216118437
-
Window
Patio Pacific
6-11
5.1
Original
https://www.petdoors.com/products/custom-window-with-petsafe
-
Door
PetSafe Pet Doors
14-24
10
Original
https://www.petdoors.com/products/petsafe-panel-door-insert
-
Window
Whiskers and Windows
4-10
7
Original
https://www.petdoors.com/products/whiskers-custom-window?variant=44661188362475
-
Sliding Glass Door
Whiskers and Windows
4-12
7
Original
https://www.petdoors.com/products/whiskers-slider?variant=46030294614251
-
Door
PetSafe Pet Doors
5-12.5
7.1
Medium
https://www.petdoors.com/products/petsafe-smart-connected
-
Door
PetSafe Pet Doors
12.5-24
11.9
Large
https://www.petdoors.com/products/petsafe-smart-connected?variant=43828661944555
-
Door
Endura Flap
9-16
6
Small
https://www.petdoors.com/products/endura-flap-single-flap-pet-door-for-thin-doors-2022-design?variant=43616813023467
-
Door
Endura Flap
9-22
8
Medium
https://www.petdoors.com/products/endura-flap-single-flap-pet-door-for-thin-doors-2022-design?variant=43616813056235
-
Door
Endura Flap
9-28
10
Large
https://www.petdoors.com/products/endura-flap-thin?variant=43616813089003
-
Door
Endura Flap
9-36
12
Extra-Large
https://www.petdoors.com/products/endura-flap-single-flap-pet-door-for-thin-doors-2022-design?variant=43616813121771
-
Door
Petsafe Pet Doors
6-18
8.25
Medium
https://www.petdoors.com/products/petsafe-freedom?variant=33932747276426
-
Door
Petsafe Pet Doors
6-25
10.25
Large
https://www.petdoors.com/products/petsafe-freedom?variant=33932747309194
-
Door
Petsafe Pet Doors
6-37
13.75
Extra Large
https://www.petdoors.com/products/petsafe-freedom?variant=33932747341962
-
Door
Petsafe Pet Doors
6-12
5.125
Small
https://www.petdoors.com/products/petsafe-freedom?variant=33932147851402
-
Door
Petsafe Pet Doors
6-18
8.125
Medium
https://www.petdoors.com/products/petsafe-extreme-weather?variant=33932750651530
-
Door
Petsafe Pet Doors
6-25
10.125
Large
https://www.petdoors.com/products/petsafe-extreme-weather-1?variant=43827736281323
-
Door
Petsafe Pet Doors
6-12
5.125
Small
https://www.petdoors.com/products/petsafe-plastic?variant=33932147589258
-
Door
Petsafe Pet Doors
6-18
8.125
Medium
https://www.petdoors.com/products/petsafe-plastic?variant=33932718342282
-
Door
Petsafe Pet Doors
6-25
10.125
Large
https://www.petdoors.com/products/petsafe-plastic?variant=33932718375050
-
Door
Petsafe Pet Doors
6-37
13.625
Extra Large
https://www.petdoors.com/products/petsafe-plastic?variant=33932718407818
-
Door
Petsafe Pet Doors
5-11
5.5
Small
https://www.petdoors.com/products/petsafe-smart-door?variant=33932166168714
-
Door
Petsafe Pet Doors
5-24
11
Large
https://www.petdoors.com/products/petsafe-smart-door?variant=33932738363530
-
Door
Petsafe Pet Doors
4-9
5.75
Basic
https://www.petdoors.com/products/petsafe-cat-flap?variant=33932147425418
-
Screen Door
Petsafe Pet Doors
8-15
8
Small
https://www.petdoors.com/products/petsafe-pet-screen-door?variant=34834553700517
-
Screen Door
Petsafe Pet Doors
8-26
10.25
Large
https://www.petdoors.com/products/petsafe-pet-screen-door?variant=34834553733285
-
Sliding Glass Door
Petsafe Pet Doors
6-9
5.25
Small
https://www.petdoors.com/products/petsafe-freedom-slider?variant=40494250819749
-
Sliding Glass Door
Petsafe Pet Doors
6-12
8.25
Medium
https://www.petdoors.com/products/petsafe-freedom-slider?variant=40494250852517
-
Sliding Glass Door
Petsafe Pet Doors
8-19
10.25
Large
https://www.petdoors.com/products/petsafe-freedom-slider?variant=40494250885285
-
Sliding Glass Door
Petsafe Pet Doors
12-23
10.25
Tall Large
https://www.petdoors.com/products/petsafe-freedom-slider?variant=40494250918053
-
Wall
Petsafe Pet Doors
5-11
5.25
Small
https://www.petdoors.com/products/petsafe-wall?variant=33932151947402
-
Wall
Petsafe Pet Doors
5-17
8.25
Medium
https://www.petdoors.com/products/petsafe-wall?variant=33932608995466
-
Wall
Petsafe Pet Doors
5-23
10.25
Large
https://www.petdoors.com/products/petsafe-wall?variant=33932609028234
-
Window
Petsafe Pet Doors
6-11
5.125
Small
https://www.petdoors.com/products/petsafe-window?variant=33932163219594
-
Window
Petsafe Pet Doors
6-12
5.125
Original
https://www.petdoors.com/products/petsafe-sash
-
Door
Pride Pet Products
5-10
4.75
Small
https://www.petdoors.com/products/pride-door?variant=33932748357770
-
Door
Pride Pet Products
5-19
8.5
Medium
https://www.petdoors.com/products/pride-door?variant=33932748357770
-
Door
Pride Pet Products
5-26
11.5
Large
https://www.petdoors.com/products/pride-door?variant=33932748357770
-
Door
Pride Pet Products
5-31
14.5
Extra-Large
https://www.petdoors.com/products/pride-door?variant=33932748750986
-
Screen Door
RCR Screens
8-14
8
Original
https://www.petdoors.com/products/rcr-easy-screen-pet
-
Window
Whiskers & Windows
4-8
6
Cat Flap
https://www.petdoors.com/products/whiskers-window-cat-door-custom?variant=43424752795883
-
Door
PetSafe Pet Doors
6-12
7.125
Original
https://www.petdoors.com/products/petsafe-4-way-locking-big-cat-door
-
Door
PetSafe
4-8
5.91
Original
https://www.petdoors.com/products/petsafe-microchip-cat-door
-
Door
PetSafe
6-17
8.25
Medium
https://www.petdoors.com/products/petsafe-extreme-weather-aluminum-pet-door?variant=43827736248555
-
Door
petdoors
6-24
10.25
Large
https://www.petdoors.com/products/petsafe-extreme-weather-1?variant=43827736281323
-
Door
PetSafe
6-27
13.75
Extra Large
https://www.petdoors.com/products/petsafe-extreme-weather-aluminum-pet-door?variant=43827736314091
-
Door
PetSafe
5-12.5
7.1
Medium
https://www.petdoors.com/products/petsafe-smartdoor-connected-pet-door?variant=43828661911787
-
Door
Petsafe Pet Doors
5-24
11.9
Extra Large
https://www.petdoors.com/products/petsafe-smartdoor-connected-pet-door?variant=43828661944555
-
wall
petdoors
8-14
6
Small
https://www.petdoors.com/products/endura-flap-builder-pro-series-for-walls?variant=43919438577899
-
wall
Endura Flap
8-21
8
Medium
https://www.petdoors.com/products/endura-flap-builder-pro-series-for-walls?variant=43919438643435
-
wall
Endura Flap
8-27
10
Large
https://www.petdoors.com/products/endura-flap-designer?variant=44683225465067
-
wall
Endura Flap
8-34
12
Exta Large
https://www.petdoors.com/products/endura-flap-designer?variant=44683225530603
-
Sliding Glass Door
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122357483
-
Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122455787
-
Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122554091
-
Sliding Glass Door
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/endura-flap-custom-slider-dual?variant=43321122652395
-
Window
Whiskers & Windows
4-10
7
Original
https://www.petdoors.com/products/whiskers-custom-window?variant=33932610764938
-
Sliding Glass Door
Whiskers & Windows
4-10
7
Original
https://www.petdoors.com/products/whiskers-custom-slider?variant=43543152132331
-
Sliding Glass Door
Pet Door Guys
9-15
6
Small
https://www.petdoors.com/products/pet-door-guys-glass?variant=40494257995941
-
Sliding Glass Door
Pet Door Guys
9-21
8
Medium
https://www.petdoors.com/products/pet-door-guys-glass?variant=40494258061477
-
Sliding Glass Door
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/pet-door-guys-glass?variant=40494258127013
-
Sliding Glass Door
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/pet-door-guys-glass?variant=40494258192549
-
Sliding Glass Door
Endura Flap
8-14
6
Small
https://www.petdoors.com/products/endura-flap-custom-severe
-
Sliding Glass Door
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-severe?variant=44239908667627
-
Sliding Glass Door
Endura Flap
8-31
10
Large
https://www.petdoors.com/products/endura-flap-custom-severe?variant=44239908700395
-
Sliding Glass Door
Endura Flap
8-36
12
Extra Large
https://www.petdoors.com/products/endura-flap-custom-severe?variant=44239908733163
-
Window
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-custom-sash?variant=44105417097451
-
Window
Endura Flap
9-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-sash?variant=44105417195755
-
Window
Endura Flap
9-27
10
Large
https://www.petdoors.com/products/endura-flap-custom-sash?variant=44105417294059
-
Window
Endura Flap
9-34
12
Extra Large
https://www.petdoors.com/products/endura-flap-custom-sash?variant=44105417392363
-
Window
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-custom-window?variant=44239947858155
-
Window
Endura Flap
9-15
6
Small
https://www.petdoors.com/products/endura-flap-custom-vinyl-window?variant=44105160818923
-
Window
Whiskers & Windows
4-10
7
Cat Flap
https://www.petdoors.com/products/whiskers-custom-sash?variant=44068976099563
-
Window
PetSafe
6-11
5
Small
https://www.petdoors.com/products/petsafe-custom-window
-
Sliding Glass Door
Endura Flap
8-14
6
Small
https://www.petdoors.com/products/endura-flap-custom-vinyl
-
Sliding Glass Door
Endura Flap
8-21
8
Medium
https://www.petdoors.com/products/endura-flap-custom-vinyl?variant=44090363117803
-
Sliding Glass Door
Endura Flap
8-32
10
Large
https://www.petdoors.com/products/endura-flap-custom-vinyl?variant=44090363183339
-
Sliding Glass Door
Endura Flap
8-38
12
Extra Large
https://www.petdoors.com/products/endura-flap-custom-vinyl?variant=44090363248875
-
Window
PetSafe
6-12
5
Small
https://www.petdoors.com/products/petsafe-custom-sash
-
Wall
Endura Flap
8-14
9.25
Small
https://www.petdoors.com/products/endura-flap-designer?variant=44683225333995
-
Wall
Endura Flap
8-21
11.25
Medium
https://www.petdoors.com/products/endura-flap-designer?variant=44683225399531
-
Wall
Endura Flap
8-27
13
Large
https://www.petdoors.com/products/endura-flap-designer?variant=44683225465067
-
Wall
Endura Flap
8-34
12
Extra Large
https://www.petdoors.com/products/endura-flap-designer?variant=44683225530603
-
Door
PetSafe
5-12.5
7.1
Medium
https://www.petdoors.com/products/petsafe-smart-connected?variant=43828661911787
-
Door
PetSafe
12.5-24
11.9
Large
https://www.petdoors.com/products/petsafe-smart-connected?variant=43828661944555
-
Sliding Glass Door
Liberty Pet Door
9-16
6
Small
https://www.petdoors.com/products/liberty-custom-slider?variant=44745192276203
-
Sliding Glass Door
Liberty Pet Door
9-22
8
Medium
https://www.petdoors.com/products/liberty-custom-slider?variant=44745192931563
-
Sliding Glass Door
Liberty Pet Door
9-28
10
Large
https://www.petdoors.com/products/liberty-custom-slider?variant=44745193586923
-
Sliding Glass Door
Liberty Pet Door
9-35
12
Extra Large
https://www.petdoors.com/products/liberty-custom-slider?variant=44745194242283
-
Sliding Glass Door
Liberty Pet Door
9-40
13
XXL
https://www.petdoors.com/products/liberty-custom-slider?variant=44745194897643
-
Sliding Glass Door
Liberty Pet Door
9-16
6
Small
https://www.petdoors.com/products/liberty-slider?variant=44600917885163
-
Sliding Glass Door
Liberty Pet Door
9-22
8
Medium
https://www.petdoors.com/products/liberty-slider?variant=44600950391019
-
Sliding Glass Door
Liberty Pet Door
9-28
10
Large
https://www.petdoors.com/products/liberty-slider?variant=44600950653163
-
Sliding Glass Door
Liberty Pet Door
9-35
12
Extra Large
https://www.petdoors.com/products/liberty-slider?variant=44600950915307
-
Sliding Glass Door
Liberty Pet Door
9-40
13
XXL
https://www.petdoors.com/products/liberty-slider?variant=44625277911275
-
Sliding Glass Door
Liberty Pet Door
9-16
6
Small
https://www.petdoors.com/products/liberty-custom-vinyl?variant=44745412706539
-
Sliding Glass Door
Liberty Pet Door
9-22
8
Medium
https://www.petdoors.com/products/liberty-custom-vinyl?variant=44745413034219
-
Sliding Glass Door
Liberty Pet Door
9-33
10
Large
https://www.petdoors.com/products/liberty-custom-vinyl?variant=44745413361899
-
Sliding Glass Door
Liberty Pet Door
9-39
12
Extra Large
https://www.petdoors.com/products/liberty-custom-vinyl?variant=44745413689579
-
Sliding Glass Door
Liberty Pet Door
9-44
13
XXL
https://www.petdoors.com/products/liberty-custom-vinyl?variant=44745413689579
-
Sliding Glass Door
Liberty Pet Door
9-16
6
Small
https://www.petdoors.com/products/liberty-vinyl?variant=44625278566635
-
Sliding Glass Door
Liberty Pet Door
9-22
8
Medium
https://www.petdoors.com/products/liberty-vinyl?variant=44625278894315
-
Sliding Glass Door
Liberty Pet Door
9-33
10
Large
https://www.petdoors.com/products/liberty-vinyl?variant=44625279221995
-
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Endura Flap Thermo Sash 3e Cat Doors for Sash Windows
Endura Flap Thermo Sash 3e Cat Doors for Sash Windows
- Regular price
- $409.99
- Sale price
- $409.99
- Regular price
-
$409.99 - Unit price
- /per
$409.99 .
Adding product to your cart
- Energy-efficient window cat door for sash windows 22" - 43" wide
- Spring-loaded, easy installation, with no permanent alterations
- Flexible, weather-tight flap remains secure in extreme conditions
- Locking cover included for added security
- Panels less than 22" will have plexiglass
Custom Order | Ships in 1-3 Weeks | Non-Returnable
Endura Flap Thermo Sash 3e Cat Doors for Sash Windows
White / 22" - 25" Edit

Product Details
The Endura Flap Thermo Sash 3e Cat Door is the perfect solution for cat owners looking to provide their feline companions with the freedom to roam without compromising the energy efficiency of their homes. This innovative cat door for sash windows is designed to fit a wide range of window sizes (22" - 43" wide, 1" thick track) and installs effortlessly with a spring-loaded design, ensuring a secure and weather-tight fit without any permanent alterations.
Constructed with an extruded aluminum frame, the Thermo Sash 3e Cat Door boasts a energy efficient design. This feature is ideal for those who want to maintain their home's insulation in extreme weather conditions, and is further enhanced by a flexible, environmentally friendly polyolefin-polymer flap that remains securely sealed even in 50 mph winds and -40°F temperatures.
The cat door's 6" x 11" flap size accommodate cats of all breeds and sizes, while the adjustable magnets lining three sides of the flap create a tight, weatherproof seal. For added security, a durable ABS plastic locking cover is included, which loads from the top.
One of the key benefits of the Thermo Sash 3e Cat Door is its removable design, making it an ideal choice for vacation homes and rentals. Homeowners can avoid permanent alterations while still providing their cats with the freedom to come and go as they please. The door's flexible flap ensures a safe, pinch-free experience for your cat, and the thermal quality of the panel guarantees longevity and eliminates heating/cooling loss.
Join the many satisfied customers who have found the Thermo Sash 3e Cat Door to be a practical, energy-efficient, and aesthetically pleasing solution for their cat's needs. Experience the perfect blend of convenience, security, and insulation with the Endura Flap Thermo Sash 3e Cat Door for Sash Windows.
If you need a larger flap size you will find them on the Endura Flap Thermo Sash 3e Pet Doors for Sash Windows page.
Features:
- Suitable for a wide range of sash windows (22" - 43" wide, 1" thick track)
- Extruded aluminum frame for durability and aesthetics
- Quick and effortless installation with spring-loaded design
- Environmentally friendly, polyolefin-polymer flap stays sealed in 50 mph winds and -40°F temperatures
Size & Measurement Guide x
Track Measurement Guide x
In order to choose the correct panel size, you will need to measure your sliding glass door track.
Please Note: These instructions are for channel-style sliding door tracks. If you have a monorail track, these instructions do not apply.
Step 1Find the Lowest Corner of Your Track

- With your sliding door open, insert one end of your measuring tape at the deepest point of the lower corner of your sliding glass door track.
- Make sure the tape measure is flush to the corner. There may be a part of your door track blocking the lowest point of the corner.
Step 2Find the Highest Corner of Your Track

- Line the measuring tape up the side of your doorway, stopping at the highest corner. Make sure the measuring tape is flush with the corner and is not blocked.
- The distance from the lowest corner of your track to the highest corner of your track is your sliding glass door track height.
- Select the Height Adjustment Range that includes your track height. Some brands have custom options if your track height does not fall into one of the ranges.
Step 3Measure Your Track Width

- Using your tape measure, find the width of the bottom track your sliding glass door slides along.
- Most aluminum panels require a track at least 1" wide and most vinyl panels require a track at least 1.5" wide.
- Check the product details to ensure the panel will fit in your track.
Size Chart
Flap Dimensions:
6"w x 11”h
The entry way your dog goes through.

Height to Raise Window
18 1/2"
How high you must raise your window in order to fit the panel into the track.Flap Size | Flap Dimension | Height To Raise Window | Recommended Pet Height |
---|---|---|---|
Small | 6" w x 11" h | 18 1/2" | 9" - 15" |
Adjustment Ranges:
- 22" - 25" Custom Order
- 25" - 28"
- 28" - 31"
- 31" - 34"
- 34" - 37"
- 37" - 40"
- 40" - 43"
Pet door has 1" framing, measure your track width to make sure that your window will accommodate the sash.
Final Sales: Adjustment Range 22" - 25" are final sale and cannot be returned. Final Sale products are made to order and will take extra time to ship.
Find The Best Pet Door Size For My Pet

A
Pet Height: inches
B
Pet Width: inches
Please fill the above fields.
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Additional Information
Flap Material
Flexible
Your Maximum Pet Size
Cats
Installation Instructions
Parts
- Sash Window Pet Door
- Foam Weather Strip
- Center Post Weather Seal Draft Stopper
- Screwdriver
Tools
- Flathead Screwdriver
Please read instructions & notes thoroughly before installation.
Step 1 Release Spring Mechanism

- Loosen the width adjustment locks at the end of the pet door insert with the screwdriver. This allows the spring mechanism to move freely from side to side.
Step 2 Check Panel Fit

- Insert the sash into the window track. Push against the spring mechanism and swing the opposite end into the opposite window track. Gently release. Tighten the width adjustment locks.
Step 3 Apply Weatherstripping

- Remove panel from window track.
- Apply the foam weather-stripping by peeling back the paper and exposing the adhesive. Unroll it along the edge of the sash, pressing to ensure it adheres. Install on both the top and the bottom. Trim to fit with scissors.
Step 4 Mount Seal Draft Stopper

- Mount the Center Post Weather Seal Draft Stopper. This strip prevents air from leaking between the window frame when raised to accommodate the sash. Trim to fit with scissors.
- Put the panel back into the window track. Tighten width adjustment locks.
Switch the Side of the Flap
You can switch which side of the sash panel the pet door flap is on to best fit your home.
Step 1
- Remove the screws on the top and bottom closest to the edge of the pet door. Then slightly loosen the screws closest to the glass. Next, slide off the side piece, then the flap assembly.

Step 2
- Rotate the flap assembly (essentially flipping it upside down) then slide it back in. Make sure the locking cover is on the same side as the width adjustment locks.

Step 3
- Replace the end spacer and screws.
LOCKING YOUR WINDOW
For a permanent lock, install a wood screw in the track immediately above the window on both sides. You will no longer be able to raise the window. For a temporary lock, place a removable wooden dowel or Charley bar in either track above the window, shown in Detail 1.

HEIGHT OF YOUR WINDOW
Make sure you place steps or ramps leading to your pet’s door at a height that works! When they go through the flap, the top of the flap should be at least 1" (2,5 cm) higher than the top of their back. Watch your pet and adjust as needed to keep them comfortable.
Videos
How to Measure Your Sash Window for a Pet Door
Design of the Endura Flap
Adjusting Magnet Strength for Training
Leaf Blower Test
FAQ
Can I choose what side the door is on? It comes standard on the left, if you are looking from the inside of the house. You can switch it to the other side if you need and that only requires a screwdriver. |
Can I get a custom height? We can only do custom widths, not custom heights. |
How much does shipping cost? Shipping is calculated at checkout. |
How wide does the track have to be for the Thermo Sash 3e to fit? Track width needs to be at least 1" thick. |
Is it possible to make one that fits a window smaller than 22"? We can, the only thing is that we would not be able to use glass so there would be quite a bit of aluminum and some customers are not happy with the aesthetics. This would also fall under the custom and non-returnable category. |
My cat is having a hard time opening the flap is there something I can do that would make it easier? You can by removing some of the magnets. On the videos tab check out the "Adjusting Magnet Strength for Training." |
What do I need to know/measure before I order? First raise up your window and check that it can go up far enough to be left with an opening 18 1/2" high. Next measure the width of the track from left to right, including going inside the track on both sides. Last measure how wide the track is that the window slides in (needs to be at least 1") |
What does custom mean? Any of the Thermo Sash doors with "Custom" listed means that the door is built to order and therefore it is non-returnable. |
What if I mis-measured? If you've mismeasured, you may be able to fix it. To make your sash cat door about 1" wider, you may purchase a width extension (or make your own using 1" x lumber). To make your window kitty door insert slightly shorter you may trim the side flanges on the spring loaded adjustment piece with a hacksaw or a jigsaw with a metal cutting blade. |
Will this door be good for more extreme weather? The Thermo Sash 3e has the Endura Flap which is far better in sealing and durability than other models. Dual pane lo-e glass offers superior insulation value. Therefore, the Thermo Sash will be a much more reliable and longer lasting option then the more inexpensive options. |
Warranty
Warranty Type: Lifetime
Duration: Lifetime of the product.
Coverage: Defects in materials and workmanship under standard regular use.
Exclusions:
Damage caused by misuse or not using the product as intended.
Improper installation.
Damage caused by chewing.
Customer Reviews
- Reviews
- Questions
Thank you for submitting a review!
Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Recommend
We built a catio to go from our kitchen window to the back patio. This cat door works perfect. It’s been in the single digits and there is no draft at all coming from the door. It was easy to train our cat to use the door as well, we just gradually added the magnets until she could just push on through. We are happy with purchase and recommend.
very nice
works like a charm, measuring was a little difficult to make sure everything was ready to go. It keeps everything well insulated, love the high quality of the glass and flap. It is air tight!
Wonderful product
My husband and I are so happy with this cat door! We have two cats that just turned a year old. We let them go outside during the daylight hours when we are home. I was constantly letting them in and out, or leaving the back storm door propped open, letting the flies and neighbor cats in as well. My husband did not want a pet door, but I convinced him to give this one a try since no holes were drilled in walls or doors. I was able to easily install the window by myself following the video instructions, adding some shims (provided) to make everything line up, and also some insulation strips (provided). For training, I took out the side magnets and shoved the bottom magnet to the side as shown in the instructions. One cat used it immediately for treats! For a day and a half, the second cat would only use it when we held the flap open. By the end of the second DAY, they were both using it regularly! After a week, I moved the bottom magnet over so that it worked on the bottom of the flap, and after pushing the flap for them a few times, they were pros. A week and a half later, I put the side magnets in, and they didn't seem to notice any difference! There is no cold air coming in at all now! Or neighbor cats! We have NOT had any problem with the aluminum "sweating" as some reviewers did. I did apply the protective treatment that came with the door. We ordered the white, and it looks nice - much less noticeable in the window than I had thought it might be. I wish I could post a pic! Highly recommend this product!
Superb
Quality exceeded my expectations. Highly recommend.
Cats are happy.
All but one cat has gotten use to the new flap. Since it was for cats, they put in only one magnet in. One side doesn't always close tight and I have to help it. I'm thinking of asking for 1 more magnet. Overall, the door is very sturdy and helps keep the cold out. I would recommend it to anyone. It is pricey, but so far, I feel it's worth it.