Volume Damper Low-Leak OBD 3000-0BDLL-70X20 Step Down Ceiling Diffuser Mounting Holes - Designed for

Mounting Holes - Designed for ceiling or sidewall application

104 P - four way * Square to round No Labor Collar * 2x2 galvaneal steel panel with seismic support holes * Soft White Options * 104 P D - multi-shutter damper with hinged perforated face * 104 P O - steel opposed blade damper with hinged perforated face * 104 P FR - U

4-way reversible door on square sizes

For damper free area chart A click here * 2563 - Out-of-Airstream fire door

Building materials rated 2 hours or less

Volume Damper Low-Leak OBD 3000-0BDLL-70X20 Step Down Ceiling Diffuser Mounting Holes - Designed forh3. 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.