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52h * 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
Ceiling opening must be 4” larger in length and width than the nominal duct size
Maximum single section size 24"x24"
Fits 1x1 ceiling grids (collar size 6"-10")
Louvers designed with rolled rib for maximum strength and rigidity
Pressure Relief Horizontal Air Up 3520-12X20 T-Bar 52h * Interlocking steel roll-formedh3. 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
