Exhaust fan assembled assembled blade diameter 18 in blade material polypropylene drive type direct drive exhaust airflow 0.000 In sp 3 740 cfm for cut-out height 19 1 2 in for cut-out width 19 7 16 in for minimum wall thickness 3 4 in frame material fiberglass guard finish powder coated guard material steel guard type intake housing material aluminum includes intake guard includes dehumidistat no maximum airflow 3 750 cfm
