Sound power belongs to the fan. Sound pressure belongs to the room. Co...
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Three motor types cover most small fans, and they differ by a factor o...
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Insulation class sets the temperature a winding can survive. Temperatu...
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IP ratings look simple until you need one. Here is what each digit act...
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Air escaping past the blade tips is pure loss, and the gap causing it ...
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Two geometrically identical fans of different sizes do not perform ide...
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FEG rated the fan. FEI rates the selection. That single difference exp...
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A weak run capacitor causes slow starting, low speed and overheating, ...
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In modern HVAC systems, air handling units (AHUs) are responsible for ...
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Above about 3 kW the choice makes itself, and below 1 kW it usually do...
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