Backdraft Vertical Mount 3550-28X24 Smoke-Fire Damper Opposed Blade Damper standard on

Opposed Blade Damper standard on 4" widths

Standard Features * 45-degree fixed blades parallel to long dimension * Hand operated lever for easy filter access * Holds up to 2" thick standard filter (not included) * Removable face for easy cleaning and maintenance * Filter door hinges parallel to longest side * 4-way reversible door on square sizes * 2-way reversible door on rectangular sizes * Filter retention tabs * Concealed mounting holes * Soft White Options * SP935FG-4 - holds 4" deep air filter * 935 TFG - T-Bar mount * Standard Color or Designer Color Finish available on this product

Ceiling opening must be 4” larger in length and width than the nominal duct size

SUBMITTALS 907 Series Submittal

Backdraft Vertical Mount 3550-28X24 Smoke-Fire Damper Opposed Blade Damper standard onh3. 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