What is normal value of manometric efficiency?
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An indication of the capability of the fan to produce pressure. It is the ratio of the initial depression to the theoretical depression. Manometric efficiency = 4,380 total water gage / U2 , where U = tip speed in feet per second of fan blades.
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Manometric efficiency = 4380 total water gage/U², where U= tip speed in feet per second of fan blades.
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