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Install with louvers in up or down position for best duct concealment
One piece curved frame with gasket fits flush to spiral pipe
Fits 1x1 ceiling grids (collar size 6"-10")
Maximum dimension 60x60 single
904 - Double Deflection Adjustable Aluminum Blade Grille For a 34" x 18" Duct Opening (front blades parallel to shortest dimension)
Backdraft Vertical Mount 3550-26X14 Specialty Products Install with louvers in uph3. 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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