Find The Best Pet Door Size For My Pet
Where To Install:
A
inchesB
inchesPlease fill the above fields.
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Door
Liberty Pet Door
9-16
6
Small
https://libertypetdoor.com/products/liberty-door?variant=44639465767141
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Door
Liberty Pet Door
9-22
8
Medium
https://libertypetdoor.com/products/liberty-door?variant=44639465865445
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Door
Liberty Pet Door
9-28
10
Large
https://libertypetdoor.com/products/liberty-door?variant=44639465963749
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Door
Liberty Pet Door
9-36
12
Extra Large
https://libertypetdoor.com/products/liberty-door?variant=44639466062053
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Wall
Liberty Pet Door
9-16
6
Small
https://libertypetdoor.com/products/liberty-wall?variant=44639467208933
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Wall
Liberty Pet Door
9-22
8
Medium
https://libertypetdoor.com/products/liberty-wall?variant=44639467405541
-
Wall
Liberty Pet Door
9-28
10
Large
https://libertypetdoor.com/products/liberty-wall?variant=44639467602149
-
Wall
Liberty Pet Door
9-36
12
Extra Large
https://libertypetdoor.com/products/liberty-wall?variant=44639467798757
Endura Flap Thermo Panel 3e
Endura Flap Thermo Panel 3e
Endura Flap Thermo Panel 3e
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- Premium aluminum-frame pet door designed for sliding glass doors with tracks at least 1" thick.
- Removable spring-loaded panel for effortless installation and removal—perfect for rentals and vacation homes.
- 3/16" clear safety glass, 59% thicker than standard, enhances energy efficiency and durability. Prefer Low-E glass? Explore our Dual Pane Thermo Panel.
- Flexible polyolefin polymer flap withstands temperatures down to -40°F, with three-sided magnetic closure for superior wind resistance.
- Available in white, black, and brushed aluminum finishes, with custom sizes for the perfect fit.
- Tall, slim flap design accommodates pets of various sizes, with removable magnets for adjustable resistance.
- Backed by a lifetime warranty, made in the USA, and built for long-term performance.
Custom Order | Ships in 3-5 Weeks | Non-Returnable
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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.
x
Endura Flap Thermo Panel 3e
White / Small / 74.75" - 77.75" Edit

Product Details
The Endura Flap Thermo Panel 3e is the ultimate solution for pet owners seeking convenience, energy efficiency, and durability in a sliding glass door pet door. No need to cut holes into your door or exterior walls. Built from heavy-duty aluminum with a spring-loaded removable panel, it installs easily without permanent alterations—making it an ideal choice for rental or vacation properties.
Engineered for year-round performance, this pet door features a flexible polyolefin polymer flap that remains functional in extreme temperatures as low as -40°F. The three-sided magnetic seal blocks drafts and resists winds up to 50 mph. The 3/16" clear safety glass is thicker than standard panels, providing superior insulation and durability.
Customizable to fit your space, the Thermo Panel 3e offers adjustable heights and custom sizes, fitting tracks at least 1" thick. It is available in sleek finishes—white (high gloss), black (dark metallic tone), or brushed aluminum—designed to complement any interior.
The included 16-gauge steel-strength locking cover adds security, giving you peace of mind when needed. It's especially great for keeping your pets inside during the night or when you're at work. A C-Clamp lock is also provided to secure the slider into the door frame, or a Charley Bar can be purchases separately.
Proudly made in the USA and covered by a lifetime warranty, the Endura Flap Thermo Panel 3e is built to withstand years of use from pets of all sizes. Enjoy easy installation, unmatched insulation, and timeless design—all while giving your pet the freedom they deserve.
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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