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6 votes
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Fan performance curve

The yellow curve corresponds to a fan that will provide mostly a set pressure differential, say, keeping fumes from escaping a tank through elsewhere than dedicated vents. If there is a circumstance ...
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5 votes

Why does the manual to my floor fan tell me to pull out the cord whenever it's not in use?

No good reason Probably the legal department decided it was a little safer to not have power to the device all the time. Practically, there is no reason to do this.
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1 vote
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Routing the flow from an axial "box" fan

Converging ducts have been constructed for years. Often an exercise to work out the angle needed for lowest losses, about 6 degrees iirc. Aslo an exercise to calculate the shortest joint lines ...
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1 vote

How can a fan keep spinning normally but suddenly move very little air?

It is possible that it is stalling. If the vector angle of the flow it creates, called relative wind, with the rotating edge of blade becomes larger than 16 degrees it may stall. When you re start the ...
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