=+12-6.

Comment on the desirability of using the fan described in Fig. 12-8 to circulate

(a) 15,000 cfm at about 1.0 in. wg total pressure,

(b) 10,000 cfm at about 1.8 in. wg total pressure,

(c) 4000 cfm at 2.1 in. wg total pressure.