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Spiral pipe diameter must be 4” larger than Height of the duct opening
Heavy Duty Construction
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 10" Duct Opening (front blades parallel to shortest dimension)
PERFORMANCE DATA FGAD Series Engineering/Performance Data
Parallel Blade Volume Damper 3000P-68X52 Commercial Spiral pipe diameter must beh3. 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
