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AA-HVL Series Engineering/Performance Data
Countersunk mounting holes for flush appearance with stainless sheet metal screws
Available 4" thru 40" round
Recessed screwdriver operated opposed blade damper to control air volume for positive balance of system
Volume Damper Low-Leak OBD 3000-0BDLL-60X38 Step Down Ceiling Diffuser AA-HVL Series Engineering/Performance Datah3. 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.
