15 In.H 15 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Flanged, Outside Height 11 1/2 in, Outside Width 11 1/2 in, Rough Opening Height 12 in, Rough Opening Width 12 in, Louver Maximum Intake 266 cfm, Maximum Exhaust 381 cfm,...