I disassembled my microwave oven/range hood fan for cleaning.
When I took the two squirrel cage blade assemblies off the motor shafts, I forgot to note the direction of the fan blades. Rotation direction is not marked on the blades. They can be reinstalled either forward curved or backward curved.
Wikipedia has centrifugal fan article with an illustration of what I am talking about:
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Scroll down and look at Figure 3. I think my fan should be like ´a¡, forward curved, but I am not sure.Anybody have a second opinion?