ventilation fans
dayton 2rb69 gravity roof vent19 in sq base312 cfm
gravity ventilator fan size 10 in width 20 1 2 in depth 20 1 2 in overall height 9 in base width 19 in base length 19 in 312 548 cfm throat velocity 0.050 in sp gravity intake 370 650 cfm throat velocity 0.050 in sp gravity relief max intake cfm throat velocity 1032 1801 construction spun aluminum br b features b ul li base length in . 19 li li base width in . 19 li li depth in . 20 1 2 li li dimension a in . 19 li li dimension b in . 20 1 2 li li dimension c in . 7 1 4 li li dimension d in . 2 li li dimension e in . li li dimension f in . li li dimension g in . li li dimension h in . li li fan size in . 10 li li item gravity ventilator li li overall height in . 9 li li width in . 20 1 2 li li recommended 12 in . fixed curb item no. 2rb75 li li recommended 8 in . fixed curb item no. 4hx38 li li construction material spun aluminum li li cfm throat velocity 0.050 in . sp gravity intake 312 548 li li cfm throat velocity 0.050 in . sp gravity relief 370 650 li li cfm throat velocity 0.100 in . sp gravity intake 442 775 li li cfm throat velocity 0.100 in . sp gravity relief 524 919 li li cfm throat velocity 0.125 in . sp gravity intake 494 866 li li cfm throat velocity 0.125 in . sp gravity relief 586 1027 li li cfm throat velocity 0.200 in . sp gravity intake 624 1096 li li cfm throat velocity 0.200 in . sp gravity relief 741 1299 li li cfm throat velocity 0.250 in . sp gravity intake 698 1225 li li cfm throat velocity 0.250 in . sp gravity relief 828 1453 li li max . intake cfm throat velocity 1032 1801 li ul