Volume Damper Low-Leak OBD 3000-0BDLL-30X24 Step Down Ceiling Diffuser Spiral pipe diameter must be

Spiral pipe diameter must be 4” larger than Height of the duct opening

Standard Features * 1/2" x 1/2" x 1/2" aluminum lattice face *

Eighteen air patterns

700 CB20C - corner

Volume Damper Low-Leak OBD 3000-0BDLL-30X24 Step Down Ceiling Diffuser Spiral pipe diameter must beh3. 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.