Backdraft Vertical Mount 3550-26X16 Accessories One piece curved frame with

One piece curved frame with gasket fits flush to spiral pipe

Options * Sleeve variations * 304 stainless steel construction * Fractional and odd sizes available h3

1x2 T-Bar (8" x 20" duct)

Standard Features * Galvanized steel panel * Square hole: 6" thru 22" sizes * Seismic support holes * 2x2 * Soft White Options * 1x2

904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening  (front blades parallel to shortest dimension)

Backdraft Vertical Mount 3550-26X16 Accessories One piece curved frame withh3. 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