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floors and partitions with fire resistance ratings of 2 hours or less (for ceiling application
Accessory to the 90 Series
Single deflection transition box mount spiral pipe grille
Steel riveted and metal formed assembly
Free area equals more than 75% of nominal size
Volume Damper Low-Leak OBD 3000-0BDLL-42X20 Residential Registers & Grilles floors and partitions with fireh3. 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.
