Pressure Relief HD 3530-14X14 Specialty Products 11/32” Wide x 1-27/32” High

11/32” Wide x 1-27/32” High slots

904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening  (front blades parallel to shortest dimension)

Available 4" thru 40" round

Soft white

Designed for return applications and as a vented access door to equipment

Pressure Relief HD 3530-14X14 Specialty Products 11/32” Wide x 1-27/32” 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