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Locking screw to hold damper in place
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
Standard Features * Full size fixed bar blade T-Bar lay-in return air grille *
Steel construction
055 T6 extruded aluminum surface mount supply diffuser * Four air patterns: CB10 - one way
Parallel Blade Volume Damper 3000P-40X32 past 12 months Locking screw to hold damperh3. 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
