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Ships within 48 hours · Estimated delivery Oct 11 - Oct 16
with 60% free area
904 - Double Deflection Adjustable Aluminum Blade Grille For a 22" x 18" Duct Opening (front blades parallel to shortest dimension)
1550 Series Submittal
RD Series Submittal
enclosed in valve to assure trouble-free operation
Pressure Relief HD 3530-12X20 Specialty Products with 60% free areah3. 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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