Thermo Sash 3e Pet Door for Sash Windows

Size Chart

For your adjustment range, you need to measure the length of your sash window track from the furthest left to right. The adjustment range of your pet door should ideally have your track length in the middle. Custom orders are subject to special restrictions. The following adjustment ranges are available:

• 22"– 25"
• 25"– 28"
• 28"– 31"
• 31"– 34"
• 34"– 37"
• 37"– 40"
• 40"– 43"

Parts List

Popular Features

• Highly insualting flap with a complete magnetic seal, designed to stay closed in winds up to 50mph
• Complete magnetic sealdesigned to stay closed in winds up to 50mph
• Polyolefin polymer flap keeps your home comfortable in temperatures between -40 and 110℉
• Dual-pane, LoE glass gives you extra insulation for your home, pairs perfectly with newer energy-efficient windows
• Four sizes available to fit cats to large breed dogs
• Fits all vertical sliding sash window widths with a track width of at least 1"
• Draft stopper and weatherstripping included for extra insulation and weather resistance
• Easy, tool-free installation in a matter of minutes

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.

Need help Installing? Take a look at our Thermo Sash Installation page.

Replacement Parts and Accessories

• Replacement Flap
• Locking Cover
• Height Extension
• Weatherstripping
• Draft stopper
• Installation Kit

Installing a Thermo Sash 3e

Variable Magnetic Resistance

Replacing the Flap in the Sash Pet Door

Switching Flap Sides

Wind Test