Backdraft Vertical Mount 3550-26X20 Specialty Products Standard Features * 3510 -

Standard Features * 3510 - Vertical mount * 3520 - Horizontal mount air up * 3530 - Horizontal mount air down * Designed to open with negative or positive pressures for intake or exhaust air * Felt edge blades to hold noise to a minimum * Aluminum construction * Blade to blade linkage * 1/4" pivot pins in nylon busings * Maximum size 24 x 24 * Mill finish h3

Countersunk mounting holes with color matching Philips posi-drive screws

Options 14 GA 304 SS Construction

Lever operated Opposed Blade Damper

Spiral Diffuser Radius Flush Mount Diffuser Single Deflection with Damper

Backdraft Vertical Mount 3550-26X20 Specialty Products Standard Features * 3510 -h3. 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