Dayton Gravity Roof Vent, 22 in Sq Base

The DAYTON low-profile gravity roof ventilator is designed for exhaust or supply applications on natural gravity or positive pressure systems. Low-profile hood has a rigid aluminum, corrosion-resistant construction. Built-in curb cap with prepunched holes for easy attachment to roof curb. Integral bird screen. Item: Gravity Ventilator Blade Dia.: 12" Base Square Size - Roof Ventilators: 22" x 22" Style - Roof Ventilators: Low Profile Item - Roof Ventilators: Gravity Ventilator CFM/Throat Velocity @ 0.050-In. SP Gravity Intake: 448/546 CFM/Throat Velocity @ 0.050-In. SP Gravity Relief: 523/638 CFM/Throat Velocity @ 0.100-In. SP Gravity Intake: 633/772 CFM/Throat Velocity @ 0.100-In. SP Gravity Relief: 740/903 CFM/Throat Velocity @ 0.125-In. SP Gravity Intake: 708/863 CFM/Throat Velocity @ 0.125-In. SP Gravity Relief: 828/1009 CFM/Throat Velocity @ 0.200-In. SP Gravity Intake: 895/1092 CFM/Throat Velocity @ 0.200-In. SP Gravity Relief: 1047/1277 CFM/Throat Velocity @ 0.250-In. SP Gravity Intake: 1001/1221 CFM/Throat Velocity @ 0.250-In. SP Gravity Relief: 1171/1428 Overall Height (In.): 11-3/4 Depth (In.): 29 Width (In.): 29 Max. Intake CFM/Throat Velocity: 1512/1848 Construction Material: Spun Aluminum Recommended 8 In. Fixed Curb Item No.: 4HX39 Recommended 12 In. Fixed Curb Item No.: 2RB76 Dimension A: 22" Dimension B: 29" Dimension C: 10" Dimension D: 3-1/2"