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1/2" spacing dual angular louvers for strength and maximum free area
inner dimension and outer dimension sizes available * Tamper proof screws * Standard Color
104 D FR - U
Minimum size is 4"x4"
Pressure Relief Horizontal Air Up 3520-24X12 Residential Registers & Grilles 1/2" spacing dual angular louversh3. 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
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