Backdraft Vertical Mount 3550-66X52

Backdraft Vertical Mount 3550-66X52h3. 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

inner dimension and outside dimension available * Available in continuous lengths with butt joints * Tamper proof screws * Standard Color

blades prevent metal on metal rattle

855 Series Engineering/Performance Data

951 Series Engineering/Performance Data

800-495-0125

904 - Double Deflection Adjustable Aluminum Blade Grille for a 48" x 18" Duct Opening (front blades parallel to shortest dimension)

All steel galvaneal construction

with 54% free area

Standard Features * Designed for return or exhaust applications * 3/16" holes on 1/4" staggered centers * Heavy gauge steel * Seismic support holes * 1x2

1/2" spacing dual angular louvers

Square or rectangular ceiling radiation butterfly damper

Building materials rated 2 hours or less