10 in. Vertical Discharge In-Line Damper

The Model 421 Broan 10 in. Vertical Discharge In-Line Damper is intended for use in vertical duct segments. It enables the proper operation of damper flaps. It also minimizes backdrafts while allowing maximum exhaust flow.”,”highlights”:[“10 in. round by 1 in. high in-line damper”,”Lightweight aluminum lovers prevent backdrafts”,”24 gauge galvanized steel construction”