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165° replaceable fusible link
Building materials rated 2 hours or less
855 Series Submittal
5/32” crossbars
Adjustable curved blade diffuser
Pressure Relief HD 3530-24X22 Smoke-Fire Damper 165° replaceable fusible linkh3. 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
