Pressure Relief Horizontal Air Up 3520-20X14 Commercial 2" ADC compliant round collar

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

904 - Double Deflection Adjustable Aluminum Blade Grille For a 42" x 18" Duct Opening (front blades parallel to shortest dimension)

Standard Features * Galvaneal steel face designed for high air volume delivery * 360 air diffusion * No Labor Collar * Seismic support hangers * Available sizes: 6"

Designer Color or Satin Anodized Finish available on this product

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

Pressure Relief Horizontal Air Up 3520-20X14 Commercial 2" ADC compliant round collarh3. 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