Pressure Relief Horizontal Air Up 3520-16X25 Specialty Products * 3 hour rated *

* 3 hour rated * UL and California State Fire Marshall approved * 4-1/4" standard frame style * Interlocking steel roll-formed blade (3) with roll-formed frames (1) * Blade lock (5) * Damper manufactured from corrosion tested galvanized mild steel (G-90) * Self locking corner (4) * 165° replaceable fusible link (2) h3

4-Way ceiling register with stiffened 1/2" fan shaped louvers for silent operation

SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)

Accessory to the 90 Series

Pressure Relief Horizontal Air Up 3520-16X25 Specialty Products * 3 hour rated *h3. 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