Thermo Sash 3e™ Sash Window Cat Door
Our customers find this cat door perfect for their homes. You can finally relax from letting your pet in and out of the house; this product takes care of that. There are no tools needed for insulation, so forget about spending money on contractors. It's easy to install, yet durable, so no matter what the weather is like, your home stays comfortable.
Every Thermo Sash 3e™ includes the award winning Endura Flap™ Door Flap -- the best engineered high performance pet door flap ever made.
The Endura Flap™ is guaranteed for 15 years!
Dual Pane, Insulated Low "E" Glass is the highest performaing glass available. It is standard on the Thermo Sash 3e™.
Spring loaded design allows for installation and removal in seconds. No tools required.
Built-In Anti-Whoops allows for 3/4" change in adjustment range to allow for small measuring errors.
Draft Stopper keeps air from coming in between the two windows.
Adjustment Ranges accommodate windows 22" - 43" wide in 3" increments. Be sure your track width is at least 1".
100% designed, engineered, and manufacturered in the USA.
Thermo Sash 3e Installation Video
Installation Instructions for the Endura Flap Thermo Sash Pet Door
2. Place the Endura Flap Thermo Sash Pet Door into the track of your sash window
3. Release the spring mechanism by loosening the thumb screw
4. Tighten the thumbscrews once the pet door has expanded the full width of the windo
5. Once you see the fit is correct add the foam weather stripping in the top and bottom channel of the pet door
6. Next install the draft stopper. Clean the top edge of your sliding window with alcohol so that you are sure to get all the debris off.
7. Remove the blue cover over the adhesive and install the draft stopper so that the edge without the adhesive is just barely touching the glass on the stationary or upper window.
Adjusting the Pet Door for your Window
Due to the fact that there are many types of windows, you may need to modify your installation using shims or similar materials. If there is a gap, you can use the shims to even out the pet door. The included weatherstripping will help further.
If your window is thicker than 1 inch, your locking cover may hit the overhanging window. If you cannot place the sash flush with the inside track wall, you might not be able to install your thermo sash with the locking cover in place.
Removing Your Thermo Sash Pet Door
You will first need to loosen the thumbscrews, you may first need to lift the pet door up to loosen the bottom screw. Then compress the window pet door and tighten the thumbscrews once again for easy removal.
Q: What 3 things do I have to know/measure when choosing a pet door for sash window?
A: Track width, Height you can raise the window, How wide the window is from left to right.
Q: What makes the Thermo Sash better than the more economy style sash window doors?
A: The Thermo Sash 3e has the Endura Flap which is superior to other more flexible vinyl models. It provides great insulation value, has dual pane, low e glass and sturdy aluminum framing. Therefore, the Thermo Sash will be a much more reliable and longer lasting option then the more inexpensive options.
Q: How wide does the track have to be for the Thermo Sash 3e to fit?
A: Track width needs to be at least 1" for the Thermo Sash 3e to fit.
Q: On the Thermo Sash 3e which options are considered custom and non-returnable?
A: All extra large as well as all 22"-25" adjustment range purchases are final sales, no returns.
Q: Can I switch the side the pet door is on with the Thermo Sash 3e? How?
A: Yes you can switch the side the pet door is on. You can start by removing the screws on the top and bottom, then sliding the flap assembly out. Once it is removed you simply flip it upside down and slide it right back in. Next you put the screws back in, tighten them all down and you’re finished.
Q: Can you make a Thermo Sash smaller than the 22" adjustment?
A: Not generally if you want glass in it. What you can do is trim down the spring loaded piece on the side, to give you an extra ¾” of compression so that you can get it down to 21-¼”. If this is still not enough then give us a call with your dimensions because we might be able to build one for you that only uses metal and not glass. This may not seem as nice aesthetically, but it will get the job done and you’ll be very happy with the Endura flap choice.
Q: Do I need tools to install the Thermo Sash?
A: No, there are no tools required to install the Thermo Sash, but just like with the Hale you can drill in a screw above the sliding window for security.
Q: How high do I have to raise my window in order to get the Extra Large flap size for a Thermo Sash 3e?
A: To get the extra large flap size, you will want to raise the window height by 30 1/2". Taking this measurement before placing the order is very important. The last thing you want to do is order a flap dimension that is too large and will not fit, meaning that you have to pay for all the return shipping fees. If it is a custom size, then it would be non-returnable.
Q: I ordered the 22" - 25" range for my Thermo Sash, but my window is actually 25.5". Is there anything I can do to make it work?
A: You can use an extension (3/4") with the anti-whoops feature, and this can help to extend your window if it's a little short. You could also slide a piece of wood into this groove to achieve the same effect.
Q: Is the Thermo Sash adjustable in height? How would I adjust it?
A: The sashes in general are not adjustable in height. They do adjust in width though! This is indicated by the “adjustment range”.