Backdraft Vertical Mount 3550-18X18 Residential Registers & Grilles 115T Series Engineering/Performance Data

115T Series Engineering/Performance Data

904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 20" Duct Opening (front blades parallel to shortest dimension)

FGAD Series Submittal

Non-standard size collar (available in 6" through 20")

PERFORMANCE DATA FGAD Series Engineering/Performance Data

Backdraft Vertical Mount 3550-18X18 Residential Registers & Grilles 115T Series Engineering/Performance Datah3. 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