CFM Static Pressure and
The information below should be used to assist in application of product when being applied at altitudes at or exceeding 1000 feet above sea level.
The air flow rates listed in the standard blower performance tables are based on standard air at sea level. As the altitude or temperature increases, the density of air decreases. In
order to use the indoor blower tables for high altitude applications, certain corrections are necessary.
A centrifugal fan is a "constant volume" device. This means that, if the rpm remains constant, the CFM delivered is the same regardless of the density of the air. However, since the air at high altitude is less dense, less static pressure will be generated and less power will be required than a similar application at sea level. Air density correction factors are shown in Table Figure and Figure Figure 1.
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