Norwesco 558011 17-Inch by 20-Inch Galvanized Roof RV38 Ventilator Review
Norwesco 558011 17-Inch by 20-Inch Galvanized Roof RV38 Ventilator Feature
Designed for composition or shake roofs. All parts are fastened by rivets. Large base offers added protection and ease of installation. No. 558011: RV38, 7-3/4" baffle diameter opening, 17" x 20" base plate, 38 sq. in. free area No. 556157: RV38 brown, 7-3/4" baffle diameter opening, 17" x 20" base plate, 38 sq. in. free area No. 558012: RV49, 9" baffle diameter opening, 18" x 22" base plate, 49 sq. in. free area
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