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904 - Double Deflection Adjustable Aluminum Blade Grille For a 32" x 18" Duct Opening (front blades parallel to shortest dimension)
1/4” Wide x 1-27/32” High slots
Extruded aluminum frame with signature line marks
2" ADC compliant round collar with bead for ease of installation (square sizes only)
round collar only) * 830 OR - factory installed opposed radial damper (sizes 6"-14") * 830 FR - U
Opposed Blade Volume Damper 3000-0BD-66X30 Smoke-Fire Damper 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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