Endura Flap® Thermo Panel 3e

Endura Flap® Thermo Panel 3e

As low as $429.00
In stock

The Thermo-Panel 3e is the best all-around patio panel dog door for sliding glass doors featuring the award-winning Endura Flap®

  • Insulated, dual pane, LoE glass, in sturdy aluminum framing
  • Safe and energy efficient flap for pets
  • No tools are required for installation, perfect for renters or vacation homes
  • Adjustable heights and custom sizes to fit all sliding glass door models
  • Note:  For all custom heights you will be contacted for your exact sliding glass door track measurements 


Size Chart

Flap Size Flap Dimension Step Over Range Overall Panel Width  
Small 6" w x 11" h 3" - 5" 11 1/4"  
Medium 8" w x 15" h 3" - 5" 13 1/4"    
Large 10" w x 19" h 3" - 5" 15 1/4"  
Extra Large 12" w x 23" h 3" - 7" 17 1/4"  

Custom heights are final sales and non-returnable

Note Endura Flaps® are not recommended for use by kittens or tiny dogs. Cats have been successful using all four sizes.


Popular Features Include...

  • Superior insulation from the dual-paned glass and an energy efficient flap that has magnets on all sides to shield against the cold or heat. The bellows on the side will expand and contract based on the weather to ensure that you have the best seal possible.
  • Easy installation due to the spring loaded top. To install your Endura Flap, place the bottom of your panel into the bottom track, push the spring loaded top down, align it to the top of your sliding glass door frame, slowly release the spring loaded top to fit into your tracks and twist the thumbscrews to lock it into place.
  • The flap rotates on a rod rather than screwed into the frame to avoid extreme wear and tear, making it a longer lasting flap. Because the flap is made of PVC rather than Vinyl, the flap will not warp or yellow in direct heat.
  • Fits into most sliding glass door including aluminum and vinyl frames with a track width minimum of 1”
  • Secure locking cover can be placed over the pet door to ensure that intruders will not be able to come in through the dog door. Locks will also be provided to secure your sliding glass pet door to your frame.
  • User adjustable step over height allows you to tailor the Panel to your pet’s personal size so that they may comfortably use the pet door. This is ideal for dogs with long legs (such as Great Danes) or short legs (such as a Corgi)
  • Option to add or decrease magnet strength to increase already significant wind resistance or training pets.
  • 100% made in the USA

Replacement Parts and Accessories:

Replacement Flap      Locks for Sliding Glass Doors      Height extension      Weatherstrip      Draftstopper


Endura Flap Pet Door Warranty

To the original purchaser, Endura Flap Pet Doors warrants this product and all of its component parts to be free of defects in materials or workmanship for a period of 15 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 Endura Flap Pet Doors together with proof of purchase, will be repaired or replaced and returned to the customer free of charge.

Endura Flap Dog Doors


The Thermo Panel 3e Patio Panel Pet Door


Installing a Patio Pacific Panel Pet Door



Variable Magnetic Resistance



Adjusting the Step Over Height




The Leaf Blower Test


Flap Size Flap Dimension Step
Stock No
Small #6 6" w x 11" h 3" – 5" 11 ¼" 01PPC06
Medium #8 8" w x 15" h 3" – 5" 13 ¼" 01PPC08
Large #10 10" w x 19" h 3" – 5" 15 ¼" 01PPC10
Extra Large #12 12" w x 23" h 3" – 7" (ships with 5") 17 ¼" 01PPC12


Height Options

  • P: 74 ¾" – 77 ¾"
  • Q: 77 ¼" – 80 ¼"
  • R: 93 ¼" – 96 ¼" (additional cost)


If your measured track height does not fall within one of the ranges above, you have a 'custom height'. Choose the range that your custom height falls in and order including specifying the exact height of your slider track inside very top to very bottom. The ranges are:

  • < 77 ¾"
  • 80 ¼" – 93 ¼"
  • >96 ¼"

In each case you will have 3" of height adjustment with the height you specify approximately in the middle of that range. 


Please Note: Your insulated glass unit must be special ordered which takes about 4 weeks. Since these are custom heights it's a final sale; no returns.

CAUTION: If your measured track height is near the bottom of the adjustment range then you should review this Note of Caution

Please Note: Don't think that the 12" width isn't enough unless you actually measure.  12" is Huge!  

Wondering how to measure your track? Review our Track Measuring Guide.


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