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Ships within 48 hours · Estimated delivery Nov 9 - Nov 14
Square collar designed for 20” × 20” duct
Building materials rated 2 hours or less
165° replaceable fusible link
5/32” crossbars
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 30" Duct Opening (front blades parallel to shortest dimension)
Pressure Relief HD 3530-24X22 Smoke-Fire Damper Square collar designed for 20”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
US$ 60.00
US$ 46.00
US$ 60.00
