Roof Vent Hood Exhaust Airflow @ 0.100 in SP 2 520 cfm Hood Height 16 in Hood Length 44 in Hood Width 48 in Cutout Length 23 1/2 in Cutout Width 23 1/2 in Housing Material Steel Assembly Partially Assembled Compatible Curb Grainger Part Number 2ZV83 3FLT5 4C454 Compatible Damper Grainger Part Number 3HHL6 Mount Type Roof Curb Number of Filters 0