Pressure Relief Vertical Mount 3510-18X14 Smoke-Fire Damper Holds up to a 1"

Holds up to a 1" filter (not included) with filter retention tabs (FG1)

One piece curved frame with gasket fits flush to spiral pipe

Louvers will be Parallel to the First Dimension

904 - Double Deflection Adjustable Aluminum Blade Grille For a 40" x 18" Duct Opening (front blades parallel to shortest dimension)

Available 4" thru 52" round

Pressure Relief Vertical Mount 3510-18X14 Smoke-Fire Damper Holds up to a 1"h3. 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. Options * Sleeve variations * Mounting flange * Adjustable counter balance to adjust various