Endura Flap Thermo Sash 3e Cat Doors for Sash Windows

Energy efficient cat door for windows with dual-pane, Low-E glass Installs in sash windows 22" - 43" in width and at least a 1" thick track Spring-loaded design for quick and easy installation  Flexible flap remains secure and reliable in -40 degrees Fahrenheit temperatures and 50 mph winds Locking cover included that loads from the top Available in white, brushed aluminum, or bronze (black) For people who don't have the option of installing a cat door in a door or wall, the Thermo Sash Cat Doors for Windows provide a simple fix without any permanent alterations to your home. These window cat doors feature a highly insulating, weather-tight panel that installs into a wide range of sash windows. No matter the season, your cat can experience free range without compromising your home's insulation in severe weather conditions.  If you need a larger flap size you will find them on the Endura Flap Thermo Sash 3e Pet Doors for Sash Windows page. Features: Extruded aluminum frame fits int