Roof Vent Hood Exhaust Airflow @ 0.100 in SP 5 156 cfm Hood Height 16 in Hood Length 57 in Hood Width 60 in Cutout Length 31 1/2 in Cutout Width 31 1/2 in Housing Material Steel Assembly Partially Assembled Compatible Curb Grainger Part Number 2ZV84 3AZH8 4C455 Compatible Damper Grainger Part Number 3HHL8 Mount Type Roof Curb Number of Filters 0