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listed Fire-Resistance Diffuser * TVB - Thermal Vapor Blanket * Square Collar
080") Aluminum Construction 1/8" GA (
Airfoil blades individually adjustable on 3/4" centers
Opposed Blade Damper standard on 4" widths
Standard Features * T-Bar lay-in filter grille with steel removable perforated face * 3/16" holes on 1/4" staggered centers * 20" x 20" x 1" filter (not included) * Square collar for 20 x 20 duct * 2x2 galvaneal steel panel with seismic support holes * Soft White Options * Square to round No Labor Collar
Volume Damper Low-Leak OBD 3000-0BDLL-46X18 Smoke-Fire Damper listed Fire-Resistance Diffuser * 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.
