Pressure Relief HD 3530-20X16 Accessories 7/8” Wide x 7/8” High

7/8” Wide x 7/8” High square holes

955 Series Submittal

Adjustable aluminum airfoil blades oriented for 1 or 2 way airflow pattern

For evaporative cooling or high-velocity exhaust applications

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