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Countersunk mounting holes with color matching Philips posi-drive screws
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening (front blades parallel to shortest dimension)
Nylon bushings on adjustable blades prevent metal on metal rattle
Adjustable baffle controllers to direct airflow horizontally or vertically
Holds up to a 4" filter (not included) with filter retention tabs (FG4)
Backdraft Vertical Mount 3550-16X44 Commercial Countersunk mounting holes with colorh3. 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
