Volume Damper Low-Leak OBD 3000-0BDLL-30X20 Smoke-Fire Damper 22 gauge butterfly style galvanized

22 gauge butterfly style galvanized steel blades

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 10" Duct Opening (front blades parallel to shortest dimension)

Performance Data With Opposed Blade Damper

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 12" Duct Opening (front blades parallel to shortest dimension)

Standard Features * Steel construction * Generous free area for quiet operation * Lever operated single-blade damper * Removable face and damper * Tension wings to stabilize damper * Available in 15"

Volume Damper Low-Leak OBD 3000-0BDLL-30X20 Smoke-Fire Damper 22 gauge butterfly style galvanizedh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.