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: Accommodates windows 22" - 43" wide in 3" increments. (Choose adjustment range from drop-down box before clicking "Add to Cart" button.) Be sure your track width is at least 1". 100% Designed, engineered and manufactured in the U.S.A.
Application: Sash Window Mount Size: X-Large Height to Raise Window: 30-1/2" Adjustment Range: 25" - 45" in 3" increments (Choose adjustment range from drop-down box before clicking "Add to Cart" button.) Flap Size: 12" x 23" Color: Satin Aluminum
Endura Thermo-Sash IIIe Installation Instructions