Roof Vent Hood Exhaust Airflow @ 0.100 in SP 3 591 cfm Hood Height 16 in Hood Length 48 in Hood Width 48 in Cutout Length 25 1/2 in Cutout Width 25 1/2 in Housing Material Steel Assembly Partially Assembled Compatible Curb Grainger Part Number 2ZV83 3AZH7 4C454 Compatible Damper Grainger Part Number 2FTV7 Mount Type Roof Curb Number of Filters 0