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Zinc plated steel closure spring
stair risers
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening (front blades parallel to shortest dimension)
w/ Steel Opposed Blade Damper
1/2" spacing dual angular louvers for strength and maximum free area
Opposed Blade Volume Damper 3000-0BD-70X62 past 12 months Zinc plated steel closure springh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee 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.
US$ 30.00
US$ 3999.50
US$ 40.20
US$ 30.00
US$ 49.10
