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1x2 T-Bar (8" x 20" duct)
Zinc plated steel closure spring
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 24" Duct Opening (front blades parallel to shortest dimension)
104 D FR - U
SD52 Submittal Drawing
Pressure Relief Vertical Mount 3510-22X22 past 12 months 1x2 T-Bar (8" x 20"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
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