Endura Flap® by Patio Pacific - Thermo Sash 3e - Sash Window Cat & Dog Door

Endura Flap® by Patio PacificSKU: 07EF-A10SS-1W-3DC

Sale price$509.99


Thermo-Sash 3e™ Sash Window Pet Door 

Key product features:

  • Exclusive - Every Thermo-Sash 3e™ includes the award-winning Endura Flap™ pet door flap - the best engineered high performance pet door flap ever made. Take a look at the Endura Flap Design Criteria used to develop this awesome flap. You don't want a leaky flap!
  • Exclusive -The Endura Flap™ is guaranteed for 15 years.
  • Exclusive -The Endura Flap™ won the coveted Fancy Publications Editors Choice for 2007.
  • Dual Pane, Insulated Low "E" Glass is the highest performing glass available. It is standard on the Thermo-Sash 3e™. This glass unit is guaranteed for 10 years.
  • Spring Load design can be installed and removed in seconds. No Tools installation.
  • Exclusive -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 manufactured in the U.S.A.

There has been lots of discussion as to why the Endura Flap is such a high performing pet door. For engineers or those looking for some more technical information here is a 74-page dog door energy efficiency study showing what makes it so special.

Note: Endura Flaps™ are not recommended for use by kittens or tiny dogs.

Sizing Information - Click Sizes Below to See Product Page

The easiest way to test flap size for your pet is to cut a hole in a piece of cardboard that is the size of the flap you are interested in, then coax your pet through (use treats if necessary). Place the cardboard in the opening of a door so they have to walk through the hole to get to the reward! See what flap size works best for your pet.

(Need help finding the best size? Call or e-mail us and we'll help you find the right size for your cat or dog!)

Click on the Sizing & Measuring tab for more details on how to measure the right size for your pet.

Flap Size Flap Dimension Height to Raise Window Stock No
Small #6 6" w x 11" h 18.5" 07PPC06
Medium #8 8" w x 15" h 22.5" 07PPC08
Large #10 10" w x 19" h 26.5" 07PPC10
Extra Large #12 12" w x 23" h 30.5" 07PPC12
Adjustment Ranges
  • 22"-25"
  • 25"-28"
  • 28"-31"
  • 31"-34"
  • 34"-37"
  • 37"-40"
  • 40"-43"

Important Note

All Extra Large and 22"-25" adjustment range sales are final, no return.
Please simulate the opening (open the window, use duct tape
to simulate the opening) to be sure this size is appropriate before ordering.

Our normal return policy applies to Small, Medium
and Large sizes as well as all other adjustment ranges.

To see the Installation Manual - Click Here

Patio Pacific Inc Endura Flap™ Pet Door 10 Year Comprehensive Warranty

To the original purchaser, Patio Pacific Inc warrants this product and all of its component parts to be free of defects in materials or workmanship for a period of 10 years from the date of delivery to the customer.

Endura Flap™ assemblies employed in commercial kennels are warranted for a period of 3 years.
Damage caused by accident, improper installation, abuse or normal wear, including damage by pets or glass breakage is specifically excluded from this warranty.

Defective materials returned to Patio Pacific Inc, together with proof of purchase, will be repaired or replaced and returned to the customer free of charge.

Pet doors of other manufacturers installed in Patio Pacific products are covered by the warranty of the other manufacturer and not by Patio Pacific Inc.

Product Details

  • Manufacturer - Patio Pacific Inc
  • Your Maximum Pet Size - Cats, Large Cats, Small Dogs, Medium Dogs, Large Dogs, X-Large Dogs
  • Type of Window - Sash (Up & Down)
  • Climate Suitability - Severe-4 Season
  • Sealing Value - Very High
  • Wind Resistance - Very High
  • Frame Material - Heavy Extruded Aluminum
  • Employs Patented “Endura Flap” - Yes
  • Insulation Value - High
  • Possible to Add Additional Magnets for Greater Wind Resistance - Yes
  • Flap Material - Engage
  • Flap Design - Single, One Part , Flexible, Insulated Flap
  • Flap Colors - Clear
  • Flap Thickness - 7/8"
  • Award Winning Design - Yes
  • Replacement Flaps Available - Yes
  • Flap Warranty (if separate) - 15 years
  • Dual or Single Pane - Dual Pane
  • Low “E” Coating - Yes
  • Ability to Lock Flap - Separate Locking Cover-Loads from Top
  • Locking Cover Material - Dimensional ABS
  • Can Be Installed In - Sash Windows
  • Warranty Period - 10 years

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Customer Reviews

Based on 12 reviews
Donna t.P.D. (Greenville, SC, US)
Great Product

It was very easy to install and a good fit. The cats took to it easily also. The only thing I don't like is our metal window has a lip on it and we can't insert the door for closing w/o lifting the window so we've had to jerry-rig a little door to keep them from using the door when we don't want them to. This wouldn't be an issue with all windows. Very happy with purchase.

Lance C.
Quality Product

I was hesitant to spend the money on a cat window since it's winter now here in Vermont. But I am glad I did. There is very little cold air coming in as a matter of fact I have a couple older windows that are less efficient that this therma sash window unit!!
Thanks for making a great product. It's worth the money.

Carol K.
window cat door

Very well made.

Awesome addition!! Don't question it, just pay for it!!

I bought the Thermo-sash IIIE when we moved into our house 6 years ago. We had one very tall chocolate lab at the time of purchase and now have a "normal" sized yellow lab as well, 87 & 65lbs each. They both use the door without hesitation, training took a handful of treats.
They often hunt squirrels from inside the AC while looking through the window portion and then with a running start they leap "FLY" through the door out into the back yard. 6 years of doing this and the only thing I've had to replace were my wood floors from their peeling out prior to takeoff... This was by far worth every penny, since we were paying a pet sitter per visit to come over and let them out. I have told many of my friends with dogs about this item. Retail store dog doors vs this item is just flat out apples and oranges!

Kate F.
Best Investment You'll Ever Make!

Gotta admit, when comparing Pacific Patio's prices with doors you can get at various retail outlets, I was a bit leery. However, after replacing my cat door for the third time in as many years, I was in a bit of a huff, Not to mention, with rising heating costs coupled with reduced income - I had to do SOMETHING! I ordered it Sunday night. It was on my doorstep Thursday morning. I had it set up in less than ten minutes. Then another ten minutes to add all the weather stripping that comes with the door. It was REALLY blowing hard the day I installed this door. I had to smile as I watched the curtain over the window. It never moved! Not even a fraction of an inch! This window is THAT weather tight! This window will pay for itself in one winter on the money I will save on my heating bill.

On the downside - My sash window has a lip the protrudes out about an inch over this new pet door on the inside. Because of that - the locking cover will not slide downward in it's tracks. My fix for this - I took a scrap piece of vinyl siding and trimmed it to fit tight in the tracks. This siding has just enough bend to it, I can squeeze it into place yet it's still stiff enough my cats can't pull it out. I consider this a truely minor inconvenience in the face of this door's outstanding quality. I was looking for weatherproof. I got weatherproof!

Surprisingly, I sent a feedback email to Pacific Patio letting them know how pleased I was with their product. I mentioned the issue with the locking cover. They assured me - they are aware of the problem and are working diligently on finding a solution.

Even still - This door is the best investment you will ever make! If you'd care to email me I can send you pictures of mine.

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