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Options * Sleeve variations * Fractional and odd sizes available h3
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 20" Duct Opening (front blades parallel to shortest dimension)
Adjustable blades oriented for 3 or 4-way air flow pattern
Spiral pipe diameter must be 4” larger than Height of the duct opening
Center margins are mounted on the backside of the grille for a streamlined continuous look
Opposed Blade Volume Damper 3000-0BD-52X12 past 12 months Options * Sleeve variations *h3. 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.
