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Patio Pacific Endura Flap™ Thermo Panel IIIe™

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In 2001 Patio Pacific set out to design and build the best pet door flap ever made and they created the award winning Patio Pacific Endura Flap™ 

It is the most highly engineered pet door flap ever made. With this door, you never have to replace worn out or leaky flaps.  Also, it has a high-quality seal, first-rate insulation and it will last forever!

Frosted Glass for Privacy?

Discount Bug Warden

SKU: pp-endura-flap-pdfd Category:
Manufacturer Patio Pacific Inc
Your Maximum Pet Size Cats, Large Cats, Small Dogs, Medium Dogs, Large Dogs, X-Large Dogs
Climate Suitability Severe-4 Season
Sealing Value Very High
Wind Resistance Very High
Type of Window Sideways Sliding
House Locking Method C-Clamp Lock
Frame Material Heavy Extruded Aluminum
Custom Heights Available Yes
Can Fit Sideways Sliding Windows Yes
Track Width Minimum 1″
Built-In Adjustment For Small Measuring Errors Yes
Tools Required For Installation None
Patented User-Adjustable Step Over Height Yes
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
High Aspect Ratio Yes
Flap Thickness 7/8″
Award Winning Design Yes
Flap Warranty (if separate) 15 years
Locking Cover Material Dimensional ABS
Can Be Installed In Single Pane Glass Sliding Glass Door, Dual Pane Glass Sliding Glass Door, Vinyl-Framed Sliding Glass Door
Dual or Single Pane Dual Pane
Low “E” Coating Yes
“Draft Stopper” Included to Seal Stationary & Sliding Panel Overlap Yes
Warranty Period 10 years
Return Period 90 days
Manufacturer’s Restocking Fee None


Flap Size Flap Dimension Step
Stock No
Small #6 6″ w x 11″ h 3″-5″ 11 1/4″ 01PPC06
Medium #8 8″ w x 15″ h 3″-7″ 13 1/4″ 01PPC08
Large #10 10″ w x 19″ h 3″-9″ 15 1/4″ 01PPC10
Extra Large #12 12″ w x 23″ h 3″-11″ 17 1/4″ 01PPC12
Height Options

  • P – 74 3/4″ – 77 3/4″
  • Q – 77 1/4″ – 80 1/4″
  • R – 93 1/4″ – 96 1/4″ (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 3/4″
  • 80 1/4″ – 93 1/4″
  • >96 1/4″

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 A Note of Caution

Note Don’t think that the 12″ width isn’t enough unless you actually measure.  12″ is Huge!  

Special Deal – Purchase a Bug Warden with any Patio Pacific patio panel and get a 20% discount on the Bug Warden. Great idea if you want ventilation through your slider on warm days.  The discount shows up in your cart.

Frosted Glass Option – If you prefer, your patio pet door panel may be special ordered with frosted (bathroom) glass. This option enables you to partially open your drapes for access to the pet door without losing privacy. Frosted glass is a final sale, no return option and requires an extra 3 to 4 weeks to ship because the glass gets custom ordered..



This Thermo-Panel IIIe™ Patio Pet Door Features

No other manufacturer can offer you a pet door that has won the Fancy Publications ‘Editors’ Choice’ Award for Innovation and Creativity!

Easy Installation

The Only panel pet door that doesn’t require a drill or other tools for installation! Exclusive user adjustable step-over to match pet door height to pet height after purchase. Built-in Anti Whoops in case your measurements are slightly off.

Safe and Secure

The Thermo-Panel IIIe Includes a provision to lock the sliding door. Beefy metal framing, sturdy locking pet flap cover. A sturdy locking cover comes with every Endura Flap pet door. The dimensionality of this cover–it’s not just flat–actually increases the strength to the equivalent of a 1/16″ steel plate.

Flexible Design

The flexible design of the Endura Flap™ is safer than other rigid pet door designs, as it eliminates the danger of pinching or snagging if something scares him while he’s walking through the door and pulls back quickly.

Superior Insulation

You’ve probably heard about other pet doors that do little to protect against hot or cold weather. The Endura Flap™ combines dual-pane glass that is slightly thicker than normal, which offers superior insulation for greater energy efficiency.

Built to Last

Anyone who has used a pet door for any length of time has seen that the cost of replacing the flaps can exceed the original cost of the door.

Most pet door flaps today use a sheet of vinyl fastened rigidly across the top of the frame with screws. As the pet goes through the flap, it begins to wear. Over time, the flap will spilt, and eventually break. This is why the Endura Flap™ uses pivots, to avoid wear and breakage. As a guarantee, it is backed by a superior warranty: 15 years!

Environmentally Friendly

Most pet doors are made with PVC, or vinyl, which is very harmful to the environment. The Endura Flap™ is made using a polyolefin-based polymer (similar to material used in food storage containers), which is a non-toxic, recyclable, and safe for our environment.

There has been lots of discussion as to why the Endura Flap is such a high performing pet door, but 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.

Fits any Sliding Glass Door (minimum track width 1″)

  • Standard ranges include 74 3/4″ – 77 3/ 4″ and 771/4″ – 80 1/4″
  • Standard ‘Oversize’ is 93 1/4″ – 961/4″
  • Custom Height <77 3/4, 80 1/4″ – 93″ and >96″ are available

Important Information about Custom Heights

Custom height patio panels are important in two situations. First, while most sliding glass door track heights accommodate the three standard door sizes we offer, some do not.  In those cases, we can build a custom Quick Panel III™ to fit your specific dimension.  The second situation is where you have a sideways sliding window.  This is actually a miniature sliding glass door, and you can install a custom height undersize Quick Panel III™ to fit in those cases provided the window track width is at least 1″.

Remember that the Quick Panel III™ is built with a 3″ spring-loaded height adjustment.  When you order in one of the custom height ranges, you will be prompted for your track height. The patio panel will be built to a height that is approximately in the middle of this 3″ range. For example, if you specify 40″, your panel will be built to adjust from about 38″ to 41″.

There are limits to the heights that we can manufacture which result from the height of the flap assembly, which is fixed, and limits to the packaging that can be shipped safely. Here are the height ranges that we can accommodate:

Custom Height Minimum & Maximum Heights
Model Minimum Maximum
Small #6 35″ 100″
Medium #8 42″ 107″
Large #10 48″ 117″
Extra Large #12 46″ 123″


Frosted Glass Option

If you prefer, your patio pet door panel may be special ordered with frosted (bathroom) glass. This option enables you to partially open your drapes for access to the pet door without losing privacy. Frosted glass is a final sale, no return option, and requires an extra 3 to 4 weeks to ship because the glass is custom ordered.

Special Bonus Offer!  Add an Amazing Bug Warden at about 20% off Regular Retail

The Bug Warden is a revolutionary new product that allows you to close your screen door completely while allowing access to your pet door. If you’re opening the sliding glass door for ventilation during the warm months, this is for you. As a once-only offer, you can purchase the Bug Warden for 20% off with the purchase of any size Thermo Panel IIIe.

There are quite a few issues that might be important for you to think about in purchasing any panel pet door. Begin with key points to get a quick overview of the most important ones. Then study the comparison chart and read the information on the patio panel FAQ page which cover the fine points of patio pet doors.

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

1 step-over is the height of the flap above the base of the pet door.We suggest that ‘flap height’ + ‘step-over’ should about equal pet shoulder height. Unlike any other panel pet door on the market, the Thermo Panel IIIe can be adjusted by the user to the step-over dimensions shown in 2″ increments. Here’s more info on the user-adjustable step-over.

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