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parallel to longest dimension
Standard Features * Galvaneal steel face designed for high air volume delivery * 360 air diffusion * No Labor Collar * Seismic support hangers * Available sizes: 6"
Designed to minimize vision into the air duct
Front blades parallel to shortest dimension
RD Series Submittal
Pressure Relief Vertical Mount 3510-18X18 Commercial parallel to longest dimensionh3. 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
