Pressure Relief Horizontal Air Up 3520-24X24 Specialty Products Front blades are parallel to

Front blades are parallel to the shortest dimension

RD Series Submittal

Allows for 4-way airflow adjustment

2550 Series Submittal

2x4 * Soft White

Pressure Relief Horizontal Air Up 3520-24X24 Specialty Products Front blades are parallel toh3. 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