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listed Fire-Resistance Diffusers * TVB - Thermal Vapor Blanket * Square collar
450 Series Submittal
850 Series Submittal
Designed for protection of ceiling openings in fire rated floor/ceiling assemblies with fire resistance ratings of 3 hours or less
* 2502 - Square or rectangular spring actuated (6) for horizontal or vertical mount
Volume Damper Low-Leak OBD 3000-0BDLL-20X10 Step Down Ceiling Diffuser listed Fire-Resistance Diffusers * TVBh3. 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.
