Roof Curb, Adjustable Width, Non-ventilated, Curb Height 12 In, Curb Square O D 64 to 72 1/2 In, Curb Square I D 60 to 68 1/2 In, 18 Gauge Galvanized Steel Construction, For Use With UL-705 InstallationsFeaturesCurb Height (In.) : 12 Curb Square I.D. (In.) : 60 to 68-1/2 Curb Square O.D. (In.) : 64 to 72-1/2 Damper Size (In.) : - For Use With : UL-705 Installations Includes : - Item : Roof Curb Type : Adjustable, Non-ventilated Construction : 18 Gauge Galvanized Steel Use w/Dayton Ventilators : Having a Square Base From 65-1/2 to 71" Mounting Flange Surface W (In.) : 4 Flashing Flange (In.) : 4
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