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904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 12" Duct Opening (front blades parallel to shortest dimension)
1 1/2 hour fire resistance rating
14 GA 304 SS Construction
Adjustable directional dampers with shut-off
Options * MAR - Mounting Angle Ring (sold in pairs - 2 needed
Opposed Blade Volume Damper 3000-0BD-64X54 Step Down Ceiling Diffuser 904 - Double Deflection Adjustableh3. 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.
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