Northwest Metal Prod. RV-49 GALV WHT ROOF VENT

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. 558012: RV49, 9" baffle diameter opening, 18" x 22" base plate, 49 sq. in. free area No. 556154: RV49 brown, 9" baffle diameter opening, 18" x 22" base plate, 49 sq. in. free area No. 557145: RV49 white, 9" baffle diameter opening, 18" x 22" base plate, 49 sq. in. free area