The Endura Flap Thermo Sash 3e installs, without the use of tools, into the track of your sash window. It features a beefy aluminum frame, LoE dual-pane glass and the energy efficient Endura Flap Pet Door. The Endura Flap Pet Door is manufactured to be flexible, safe, and energy efficient in all climates. The transparent, dual-pane flap seals tightly against the outside weather using a patented system of magnets. When closed, the flaps siginificantly reduce air conditioning and heat loss. There are up to seven width adjustment ranges, each with a three inch adjustment range, to fit a variety of sash windows (be sure to measure from the furtherst points left and right to get an accurate measurement). Opening height is another inmportant measurement to ensure your window fits: Small flap requies 18.5" clearance, Medium flap requires 22.5" clearance, Large flap requires 26.5" clearance and Extra Large requires 30.5" clearance. All doors come with locking cover and installation instructions. Tools are not required for installaton!

• Dimensions: 12 w x 23 h .in
• Self Framing: Yes
• Insulation/Sealing Value: High
• Frame Color: Satin (Silver)
• Frame Material: Heavy-duty Extruded Aluminum
• Includes Locking Cover / Loads From: Yes/Top
• Flap Color: Translucent
• Flap Material: Engage/Polyolefin
• Wind ResistanceVery High
• 1 or 2 Flaps: 1
• Outer Frame: Window Must Raise 30 1/2"
• Sash Window Width Range: 40-43"
• Returns Accepted Within: Special/No Returns
• Warranty Length: 15 Years