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Installation Instructions * UL approved installation instructions
SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)
w/ Screwdriver Operated Opposed Blade Damper
Available in 6”–12” collar sizes
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 8" Duct Opening (front blades parallel to shortest dimension)
Parallel Volume Damper Low Leak 3000PLL-44X28 Smoke-Fire Damper Installation Instructions * UL approvedh3. 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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