Backdraft Vertical Mount 3550-14X30 Specialty Products For damper free area chart

For damper free area chart B click here * 2665 - Round fire door for vertical mount only

Standard Features * 1/2" spacing dual angular louvers * 22 & 20 gauge cold roll steel * Install with louvers in up or down position for best duct concealment * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 1033 - 1/3" spacing available in limited sizes * A-1050 -

Opposed Blade Damper standard on 4" widths

Spring actuated curtain-type fire damper with 2 1/4" round connection for horizontal or vertical mount

Extended sleeve (2751)

Backdraft Vertical Mount 3550-14X30 Specialty Products For damper free area charth3. 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