=+12-4.

The fan of Fig. 12-8 is rated at standard sea-level density. Suppose it is to be used in Denver, CO, where the elevation is 5280 ft.

(a) Construct total pressure and shaft power characteristics for the selection zone for the new condition.

(b) Compute the percent change in power between sea level and 5280 ft elevation for a volume flow rate of 11,000 cfm.