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Endura Flap Thermo Panel 3e

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

  • Insulated dog door for sliding glass door has dual pane and 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"

Note: Endura Flap is not recommended for kittens or tiny dogs. Cats have been successful using all four sizes.

Popular Features

  • 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.
  • 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 trai100% made in the USA

Replacement Parts and Accessories

Replacement Flap

Locks for Sliding Glass Doors

Height extension


Draft stopper


1 Piece Pet Door 2 Piece Pet Door
1x Panel Pet Door 1x Top Glass Panel Section
1x Sliding Door Clamp 1x Bottom Flap Section
1x Foam Weather Strip 4x Hex screws
1x Center Post Weather Seal Draft Stopper 1x Hex wrench
1x Sliding Door Clamp
1x Foam Weather Strip
1x Center Post Weather Seal Draft Stopper

The Thermo Panel 3e Patio Panel Pet Door


Installing a Patio Pacific Panel Pet Door 


Variable Magnetic Resistance 


Adjusting the Stepover Height 


The Leaf Blower Test 


Endura Flap Dog Doors Durability 

Endura Flap® Pet Door Warranty

Endura Flap products have a lifetime warranty against defects in materials and workmanship under standard regular use. Damage caused by not using the product as intended, improper installation and chewing is not covered under this warranty.

Customer Reviews

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