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 Unassembled, Compatible Curb Grainger Part Number 2ZV83, 3FLT5, 4C454, Compatible Damper Grainger Part Number 3HHL6, Mount Type Roof Curb, Number of Filters 0. This item has been restricted from sale in the following state (s): []