Volume Damper Low-Leak OBD 3000-0BDLL-72X60 Step Down Ceiling Diffuser Minimum size is 4"x4"

Minimum size is 4"x4"

Standard Features * Heavy duty honeycomb construction * Blades run parallel to longest dimension given * Gym Grade - includes welded core and extra supports for heavy duty application * Mounting holes for sidewall and ceiling application * Recessed screwdriver operated opposed blade damper to control air volume for positive balance of system * Soft White Options * No mounting holes * Tamper Proof Screws * Standard Color

1x2 T-Bar (8" x 20" duct)

For damper free area chart A click here * 2663 - Out-of-Airstream fire door

2x4 T-Bar (22" x 46" duct)

Volume Damper Low-Leak OBD 3000-0BDLL-72X60 Step Down Ceiling Diffuser Minimum size is 4"x4"h3. 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.