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904 - Double Deflection Adjustable Aluminum Blade Grille for a 48" x 18" Duct Opening (front blades parallel to shortest dimension)
57% free area * 1307: 13/16" lattice opening
1/4” crossbars
Options * 3000 OBDLL - Low Leak Air Control Damper
Parallel Volume Damper Low Leak 3000PLL-26X16 Commercial 904 - Double Deflection Adjustableh3. 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
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