=+12-5.

The fan of Fig. 12-10 is rated at sea level. Suppose it is to be used in Albuquerque, NM, where the elevation is 1618 m.

(a) Construct the total pressure characteristic for 800 rpm.

(b) Com-

pute the percent change in power from sea level to 1618 m for 900 rpm and a volume flow rate of 150 m3/min.