Opposed Blade Volume Damper 3000-0BD-28X10 past 12 months Back blades are parallel to

Back blades are parallel to the longest dimension

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 12" Duct Opening (front blades parallel to shortest dimension)

Blades parallel to shortest dimension

Negator stainless steel closure springs mounted on spring pin brackets

Performance Data With Opposed Blade Damper

Opposed Blade Volume Damper 3000-0BD-28X10 past 12 months Back blades are parallel toh3. 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.