Roof Vent Hood Exhaust Airflow @ 0.100 in SP 20 811 cfm Hood Height 24 in Hood Length 100 in Hood Width 108 in Cutout Length 63 1/2 in Cutout Width 63 1/2 in Housing Material Steel Assembly Unassembled Compatible Curb Grainger Part Number 2ZV87 3AZJ8 Compatible Damper Grainger Part Number 6WRK9 Mount Type Roof Curb Number of Filters 0