cupolas
dayton 4hx39 roof curb8 in high
roof curb fixed nonventilated inside square 17 1 2 in outside square 20 1 2 in curb height 8 in 18 gauge galvanized steel construction for general ventilation application use with dayton ventilators having a 22 in square base br b features b ul li curb height in . 8 li li curb square i.d. in . 17 1 2 li li curb square o.d. in . 20 1 2 li li damper size in . 15 x 15 li li for use with ul 705 applications li li includes damper tray li li item roof curb li li type fixed nonventilated li li construction 18 gauge galvanized steel li li use w dayton ventilators having a 22 square base li li mounting flange surface w in . 2 li li flashing flange in . 2 li ul