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.Free U.S. Shipping & Lifetime Warranty For All Endura Flap Pet Doors
Insulated Freedom for Sash Windows
Fast & Free Shipping in the USA.
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What's in the box?
How does the Thermo Sash Window Pet Door work?
What type of windows does the Thermo Sash Pet Door fit?
Do I need tools to install the Thermo Sash Window Pet Door?
Explore all questionsWe have a 90-day return policy, which means you have 90 days after receiving your item to request a return.
To be eligible for a return, your item must in new, resellable condition. Pet doors that have been installed are not eligible for return. Custom orders are final sale and not eligible for return.
To start a return, you can contact us at customerservice@enduraflap.com. Please note that returns will need to be sent to the following address: 254 Granada Drive, San Luis Obispo CA 93401
If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at customerservice@enduraflap.com.
Damages and issues
Please inspect your order upon reception and contact us within 7 business days if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Custom products are final sale and not eligible for return.
Exchanges
We do not offer exchanges. The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
European Union 14 day cooling off period
Notwithstanding the above, if the merchandise is being shipped into the European Union, you have the right to cancel or return your order within 14 days, for any reason and without a justification. As above, your item must be in the same condition that you received it. You’ll also need the receipt or proof of purchase.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at customerservice@enduraflap.com.
After 90 Day Rules for Endura Flap Products:
Time frames begin the day that you receive your order.
Do you charge shipping for returns? We will send you a label for all returns in the US, but the return label is not free and is charged to your account. We do not refund any of the original shipping charges initially paid on the order.
If you are not satisfied with your purchase for any reason, and need to return pet door products please email customerservice@enduraflap.com or call (800) 826-2871 to submit a return request for a Return Merchandise Authorization (RMA) number within 90 days of receipt. To receive a refund of the merchandise cost the return item must be in original, resalable condition within 90 days of receipt for a full refund on the product cost.
When shipping returns back please make sure to package them properly to prevent damage. The provided return label will have the proper return address on it. All refunds will amount to the cost of the item, including taxes if applicable. We do not refund paid shipping. We process returns daily with the exception of weekends and holidays.
Product Details
The Thermo Sash 3e Pet Door for Sash Windows is built for homeowners who want pet freedom without compromising the performance of their window. By integrating an insulated panel directly into the sash track, it creates a dedicated access point that works with your window rather than replacing it.
Cold Weather Performance and Magnetic Sealing
At the core is a flexible polyolefin polymer flap engineered to remain responsive even in temperatures down to minus 40 degrees Fahrenheit. Magnets line the edges to encourage a consistent seal in windy or cold conditions, while the resistance can be adjusted by adding or removing magnets to suit confident dogs or more cautious cats.
Structured Frame and Integrated Insulation
The extruded aluminum frame offers a clean, structured appearance that pairs naturally with many window styles. Weather stripping and a top loading locking cover are included to help reduce drafts and give you control when pets need to stay inside. Installation relies on a spring loaded compression system that holds the panel securely within the sash track, making it especially practical for renters or seasonal properties. The window must open high enough to accept the full panel height, which varies by flap size.
Custom and Extra Large Configurations
Extra Large 22 inch to 25 inch width panels are produced with plexiglass and built to order. Custom made panels are crafted to the specified dimensions and are non returnable.
6"w x 11”h
The entry way your dog goes through.
18 1/2"
How high you must raise your window in order to fit the panel into the track.8"w x 15"h
The entry way your dog goes through.
22 1/2"
How high you must raise your window in order to fit the panel into the track.10"w x 19"h
The entry way your dog goes through.
26 1/2"
How high you must raise your window in order to fit the panel into the track.12"w x 23"h
The entry way your dog goes through.
30 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" |
| Medium | 8" w x 15" h | 22 1/2" | 9" - 21" |
| Large | 10" w x 19" h | 26 1/2" | 9" - 27" |
| Extra Large | 12" w x 23" h | 30 1/2" | 9" - 34" |
For your adjustment range, you need to measure the length of your sash window track from the furthest left to right. The adjustment range of your pet door should ideally have your track length in the middle. Custom orders are subject to special restrictions. The following adjustment ranges are available:
Please read instructions & notes thoroughly before installation.