Pressure Relief Horizontal Air Up 3520-16X16 Step Down Ceiling Diffuser Standard Features * Single plaque

Standard Features * Single plaque ceiling diffuser * 360 air diffusion * Hinged-down core for easy duct access * No Labor Collar * Seismic support hangers * Available sizes: 6"-10"

Perforated Face Grille

For damper free area chart B click here * 2665 - Round fire door for vertical mount only

* 2634 - Square or rectangular Spring actuated (6) out-of-airstream fire damper for horizontal or vertical mount

3% maximum leakage with a pressure differential 3" W

Pressure Relief Horizontal Air Up 3520-16X16 Step Down Ceiling Diffuser Standard Features * Single plaqueh3. 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