Roof Vent Hood Exhaust Airflow @ 0.100 in SP 8 809 cfm Hood Height 16 in Hood Length 78 in Hood Width 72 in Cutout Length 43 1/2 in Cutout Width 43 1/2 in Housing Material Steel Assembly Partially Assembled Compatible Curb Grainger Part Number 2ZV85 3AZJ4 3C597 Compatible Damper Grainger Part Number 6WRK7 Mount Type Roof Curb Number of Filters 0