cupolas
dayton 4hx51 roof curb12 in high
roof curb fixed nonventilated inside square 37 1 2 in outside square 40 1 2 in curb height 12 in 18 gauge galvanized steel construction for general ventilation application use with dayton ventilators having a 42 in square base br b features b ul li curb height in . 12 li li curb square i.d. in . 37 1 2 li li curb square o.d. in . 40 1 2 li li damper size in . 35 x 35 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 42 square base li li mounting flange surface w in . 2 li li flashing flange in . 2 li ul