30" GRAVITY VENTILATOR, BASE 34-1/2" X 34-1/2"

ITEM: GRAVITY VENTILATOR, LOW PROFILE, FAN SIZE:30", DAMPER SIZE:31" X 31", BASE DIMS:34-1/2" x 34-1/2", CFM/Throat Velocity @ 0.050-In. SP Gravity Intake 3153/504, CFM/Throat Velocity @ 0.050-In. SP Gravity Relief:3646/583, CFM/Throat Velocity @ 0.100-In. SP Gravity Intake:4459/713, CFM/Throat Velocity @ 0.100-In. SP Gravity Relief:5156/825, CFM/Throat Velocity @ 0.125-In. SP Gravity Intake:4985/798, CFM/Throat Velocity @ 0.125-In. SP Gravity Relief:5765/922, CFM/Throat Velocity @ 0.200-In. SP Gravity Intake:6306/1009, CFM/Throat Velocity @ 0.200-In. SP Gravity Relief:7292/1167, CFM/Throat Velocity @ 0.250-In. SP Gravity Intake:7050/1128, CFM/Throat Velocity @ 0.250-In. SP Gravity Relief:8153/1304, CONSTRUCTION MATERIAL: GALVANIZED STEEL, OVERALL DIMS:38"H x 57"W x 60"D, WEIGHT:270LBS, IN BULK, MADE IN USA.