Volume Damper Low-Leak OBD 3000-0BDLL-44X40 Smoke-Fire Damper 165° standard * All sizes

165° standard * All sizes utilize one main curtain stay * Galvanized finish h3

For ceiling or sidewall applications

Ceiling opening must be 4” larger in length and width than the nominal duct size

Fractional

Performance Data With Opposed Blade Damper

Volume Damper Low-Leak OBD 3000-0BDLL-44X40 Smoke-Fire Damper 165° standard * All sizesh3. 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.