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Ships within 48 hours · Estimated delivery Sep 10 - Sep 15
with 57% free area
Standard Features 1” rim size (2” larger than nominal duct size / order size) 14 gauge steel construction Countersunk mounting holes for a flush appearance 1-27/32” Wide x 11/32” High slots on staggered centers
3 cone steel diffuser with hinged core for easy duct access
Plated Metal or Wood Finish available on this product
Tool operated Opposed Blade Damper
Pressure Relief Horizontal Air Up 3520-18X16 T-Bar with 57% free areah3. 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
