cupolas
dayton 3c437 roof curbadjustable width
roof curb adjustable width nonventilated outside square 23 1 2 to 32 in curb height 12 3 8 in 18 gauge galvanized steel construction for general ventilation use with dayton ventilators having a square base from 25 to 30 1 2 inches br b features b ul li curb height in . 12 3 8 li li curb square i.d. in . 19 1 2 to 28 li li curb square o.d. in . 23 1 2 to 32 li li damper size in . 19 to 27 sq. li li for use with ul 705 applications li li includes damper tray li li item roof curb li li type adjustable nonventilated li li construction 18 gauge galvanized steel li li use w dayton ventilators having a square base from 25 to 30 1 2 li li mounting flange surface w in . 1 1 8 li li flashing flange in . 1 1 8 li ul