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Standard Features * Extruded aluminum (
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
Designer Color
Single deflection radius mount spiral pipe grille with adjustable blades
Available 4" thru 52" round
Pressure Relief Horizontal Air Up 3520-6X6 Specialty Products Standard Features * Extruded aluminumh3. 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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