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Efficiency is slightly less than that of the airfoil design. Backward inclined or backward curved blades are single thickness with 9 to 16 blades curved or inclined away from the direction of rotation. Air leaves the impeller at a velocity less than its tip speed. Relatively deep blades provide efficient expansion with the blade passages.
Applications - Primary applications include general heating systems, and ventilating and air conditioning systems. Also used in some industrial applications where the airfoil blade is not acceptable because of a corrosive and/or erosive environment.
Backward Inclined
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