Roof Vent Hood Exhaust Airflow @ 0.100 in SP 7 251 cfm Hood Height 16 in Hood Length 68 in Hood Width 60 in Cutout Length 37 1/2 in Cutout Width 37 1/2 in Housing Material Steel Assembly Partially Assembled Compatible Curb Grainger Part Number 2ZV84 3AZJ2 4C455 Compatible Damper Grainger Part Number 3HHN1 Mount Type Roof Curb Number of Filters 0