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For damper free area chart B click here * 2665 - Round fire door for vertical mount only
Minimum size is 4"x4"
linkage and handle enclosed in valve to assure trouble-free operation * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Steel multi-shutter damper * Soft White Options * 200 O - steel lever operated opposed blade damper * Tamper proof screws * Standard Color
Install with louvers in up or down position for best duct concealment
Standard Features * 2561 - Square or rectangular fire door for vertical mount only
Volume Damper Low-Leak OBD 3000-0BDLL-58X22 Step Down Ceiling Diffuser 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.
US$ 38.00
US$ 179.00
US$ 1349.50
US$ 1349.50
