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Double deflection radius mount spiral pipe grille with adjustable blades
* UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 24" Duct Opening (front blades parallel to shortest dimension)
floors and partitions with fire resistance ratings of 2 hours or less (for ceiling application
Backdraft Vertical Mount 3550-18X6 Commercial Double deflection radius mount spiralh3. Standard Features * 3550 Vertical mount * 3560 Horizontal mount air up * 3570 Horizontal mount air down * 3580 Round sizes available 5" to 24" * All non motorized backdraft dampers * Dampers are opened by air pressure differential and closed by gravity * 16 gauge channel frame with 26 gauge galvanized blades * Out of airstream linkage * Blades are vee stiffened 26 gauge for strength and stability * Square steel pivot pins * Nylon bushings * Single
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