Gravity Roof Vent,19 In Sq Base,312 CFM
100 in SP 524 cfm, Housing Material Aluminum, Assembly Fully Assembled, Compatible Curb Grainger Part Number 2RB75, Compatible Damper Grainger Part Number 4HX38, Mount Type Roof Curb, Number of Filters 0.Gravity Ventilator, Exhaust Airflow @ 0.