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Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
7/8” Wide x 7/8” High square holes
1x2 T-Bar (8" x 20" duct)
Adjustable aluminum airfoil blades oriented for 1 or 2 way airflow pattern
Available 4" thru 40" round
Pressure Relief HD 3530-20X16 Accessories 7/8” Wide x 7/8” Highh3. 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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