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Standard Features * Fixed bar blades parallel to 1st dimension given *
SD52 - Transition Box Spiral Pipe Grille (Single Deflection)
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
904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 16" duct Opening (front blades parallel to shortest dimension)
Parallel Volume Damper Low Leak 3000PLL-70X66 Specialty Products Standard Features * Fixed barh3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3. Options * 3000 PLL Low Leak Air Control
