Volume Damper Low-Leak OBD 3000-0BDLL-70X20 Step Down Ceiling Diffuser 4-way reversible door on square

4-way reversible door on square sizes

Adjustable curved blade diffuser

Standard Features * 2601 - Square or rectangular for vertical mount only

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

Volume Damper Low-Leak OBD 3000-0BDLL-70X20 Step Down Ceiling Diffuser 4-way reversible door on squareh3. 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.