The model L70 true round damper is manufactured using 16 gauge galvanized steel. The frame is roll formed with two beads which adds rigidity to the frame and acts as a stop for the attached ductwork. This damper is designed to tightly close when the blade contacts the ¼" neoprene seal that is attahed to the damper frame.

Designed to operate at a maximum differential pressure of 4" w.g.