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see 1560 Series * Tamper proof screws * Standard Color
Lever Operated Opposed Blade Damper
904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" Duct Opening (front blades parallel to shortest dimension)
Square to round 2" collar with roll formed retention bead
Parallel Volume Damper Low Leak 3000PLL-50X20 Residential Registers & Grilles see 1560 Series * Tamperh3. 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
