Roof Curb, Fixed, Nonventilated, Curb Height 12 In., Curb Square O.D. 39 In., Curb Square I.D. 36 In., Flashing Flange 1 1/2 In., 18 Gauge Galvanized Steel Construction, Use w/Dayton Ventilators Having a 40 1/2 In Square Base, For Use With Flat Roofs Only, Includes Damper TrayFeaturesCurb Height (In.) : 12 Curb Square I.D. (In.) : 36 Curb Square O.D. (In.) : 39 Damper Size (In.) : 33-1/2 x 33-1/2 For Use With : Flat Roofs Only Includes : Damper Tray Item : Roof Curb Type : Fixed, Nonventilated Construction : 18 Gauge Galvanized Steel Use w/Dayton Ventilators : Having a 40 1/2" Square Base Mounting Flange Surface W (In.) : 2 Flashing Flange (In.) : 2
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