Pressure Relief Horizontal Air Up 3520-24X16 T-Bar linkage and handle enclosed in

linkage and handle enclosed in valve to assure trouble-free operation * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Steel multi-shutter damper * Soft White Options * 200 O - steel lever operated opposed blade damper * Tamper proof screws * Standard Color

Nylon bushings on adjustable blades to prevent metal on metal rattle

Note: Sizes are Listed Nominal Duct Opening

Allows for 2-way airflow adjustment

951 Series Submittal

Pressure Relief Horizontal Air Up 3520-24X16 T-Bar linkage and handle enclosed inh3. 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