Pressure Relief Horizontal Air Up 3520-20X14 Commercial 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening  (front blades parallel to shortest dimension)

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

450 Series Submittal

Designer Color or Satin Anodized Finish available on this product

2" ADC compliant round collar with a bead for ease of installation

Pressure Relief Horizontal Air Up 3520-20X14 Commercial 904 - Double Deflection Adjustableh3. 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