Volume Damper Low-Leak OBD 3000-0BDLL-66X36 Step Down Ceiling Diffuser 3 or 4 way air

3 or 4 way air patterns from face * One size fits 6" thru 16" (collar by others) * Soft White

For evaporative coolers or central blower systems

Extruded aluminum frame with steel roll formed blades and steel multi-shutter damper

* UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w

Opposed Blade Damper

Volume Damper Low-Leak OBD 3000-0BDLL-66X36 Step Down Ceiling Diffuser 3 or 4 way airh3. 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.