Volume Damper Low-Leak OBD 3000-0BDLL-70X48 Residential Registers & Grilles For damper free area chart

For damper free area chart B click here * 2565 - Round fire door for vertical mount only

Standard Features * Single plaque ceiling diffuser * 360 air diffusion * Hinged-down core for easy duct access * No Labor Collar * Seismic support hangers * Available sizes: 6"-10"

Steel construction

One piece curved frame with gasket fits flush to spiral pipe

Reinforced welded core and extra supports for heavy duty application

Volume Damper Low-Leak OBD 3000-0BDLL-70X48 Residential Registers & Grilles For damper free area charth3. 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.