These are less efficient than backward inclined. Require the lowest speed of any centrifugal to move a given amount of air. Blades are curved forward in the direction of rotation.
Applications : Used for low pressure heating, ventilating, and air conditioning systems, ranging from room air conditioners to residential furnaces.
Backward Inclined :
These are high efficient blades. The bladders are flat and of single thickness.
Applications : Used for large heating, ventilating, air conditioning and industrial system where the blade may be subjected to corrosive or erosive environments.
Radial Blade :
Generally the least efficient of the centrifugal fans. The blades are “radial” to the fan shaft
Applications : For material handling and moderate to high pressure industrial applications
Radial Tip :
More efficient than the radial blade. The blades are radial to the fan shaft at the outer extremity of the impeller, but gradually slope towards the direction of wheel rotation.
Applications : Designed for wear resistance in mildly erosive air streams.
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