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Ships within 48 hours · Estimated delivery Aug 9 - Aug 14
linkage and handle enclosed in valve to assure trouble-free operation
22 gauge steel blades with an insulated blanket
* UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w
* 2550 - Round Spring actuated (6) damper for vertical or horizontal mount
Pressure Relief HD 3530-18X14 Specialty Products linkage and handle enclosed inh3. 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
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