Pressure Relief Horizontal Air Up 3520-20X14 Commercial 4-way flush step down steel

4-way flush step down steel diffuser

Available in even sizes 6" to 20" and 24"

Designer Color or Satin Anodized Finish available on this product

Round ceiling radiation butterfly damper

3 or 4 way air patterns from face * One size fits 6" thru 16" (collar by others) * Soft White

Pressure Relief Horizontal Air Up 3520-20X14 Commercial 4-way flush step down steelh3. 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