12 in 15"H-W 5.75"L Alu Wall Backdraft Dampr, 12-1/2 in x 12-1/2 in, Aluminum

Includes Prepunched Mounting Holes; Felt Series 556 For use with Vertical Mounted Exhaust FansYou may also like Dayton Exhaust Fan Venturi Frame,34x34,Galv 10E038.