Thermo-Sash IIIe Pet Doors for Sash Windows

Thermo-Sash IIIe Pet Doors for Sash Windows
  • Thermo-Sash IIIe Pet Door Sash Windows Locking Cover
  • Thermo-Sash IIIe Pet Door Sash Windows
  • Thermo-Sash IIIe Pet Door Sash Windows
  • Thermo-Sash IIIe Pet Door Sash Windows
  • America's Finest Pet Doors Patio Pacific
  • Editors Choice Award Endura Flap Pet Doors
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Includes dual-pane, insulated, low "E" glass plus the award-winning Endura Flap™.


  • Exclusive - Every Thermo-Sash IIIe™ 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. 
  • 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 IIIe™. 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.
Note Endura Flaps™ are not recommended for use by kittens or tiny dogs.
Size Chart:
Small         Flap Size: 6" x 11"        Height to Raise Window:  18 1/2"
Medium     Flap Size: 8" x 15"        Height to Raise Window:   22 1/2"
Large        Flap Size:  10" x 19"     Height to Raise Window:   26 1/2"
X-Large     Flap Size:  12" x 23"     Height to Raise Window:   30 1/2"
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.

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