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14" * Soft White Options * Field installable Bowtie Damper (BD) * TVB - Thermal Vapor Blanket * HVD - Hinge Down Face
Note: Sizes listed are the duct or opening size the grille will fit into
904 - Double Deflection Adjustable Aluminum Blade Grille For a 42" x 18" Duct Opening (front blades parallel to shortest dimension)
1 for each end)
Backdraft Vertical Mount 3550-14X14 Smoke-Fire Damper 14" * Soft White Optionsh3. 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
