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12" and 14") * HVD OR - factory installed opposed radial damper (sizes 6"-14") * HVD FR - U
listed Fire-Resistance Diffusers * TVB - Thermal Vapor Blanket * Square collar
Standard Features * 1" rim size (2" larger than nominal duct size) * 14 gauge steel * 1305: 1/2" lattice opening
* 2650 - Round spring actuated (6) damper for vertical or horizontal mount
Parallel Volume Damper Low Leak 3000PLL-52X48 Step Down Ceiling Diffuser 12" and 14") * HVDh3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee 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. Options * 3000 PLL Low Leak Air Control
