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In each fan catalog the performance tables are based on standard air density (1.204 kg/m3), which is defined as dry air at 20°C at sea level (29.92 Hg barometric pressure).The fan performance tables provide the fan RPM and brake horsepower requirements for the given volume flow and static pressure, at standard air density.
When the fan performance is not at standart conditions the performance must be converted to standart conditions before entering the fan performance tables. The fan performance is converted to standart conditions by using the performance correction factors for Altitude and Temperature shown below.
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