Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 150, Propeller Fan with Wheel nn Shaftfor Urlt Fig. 151. Fan Belt-Connected to Motor. Example. Assuming a velocity of 800 feet per minute through a 4-footfan, what volume will be delivered per minute, and what speed and horse-power will be required? 184 HEATING AND VENTILATION 175 TABLE XXXVIDisc Fans, their Capacity, Speed, etc. Dia. of Fan, inInches Rev Flit MlN. Cubic Fket ofMoved A IK Reqiiiuh 18 952 1,700 .27 • 24 716 3,100 .50 30 572 4,900 .7S 36 476 7,100 42 40S 9,400 -is 3
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 150, Propeller Fan with Wheel nn Shaftfor Urlt Fig. 151. Fan Belt-Connected to Motor. Example. Assuming a velocity of 800 feet per minute through a 4-footfan, what volume will be delivered per minute, and what speed and horse-power will be required? 184 HEATING AND VENTILATION 175 TABLE XXXVIDisc Fans, their Capacity, Speed, etc. Dia. of Fan, inInches Rev Flit MlN. Cubic Fket ofMoved A IK Reqiiiuh 18 952 1,700 .27 • 24 716 3,100 .50 30 572 4,900 .7S 36 476 7,100 42 40S 9,400 -is 343 12,000 54 317 15,800 60 286 19,400 72 238 28,300 The area of a 4-foot fun is ) square feet; and at 800 velocitythe volume would he ) X 800 = 10,000 cubic feet. Next solvefor the speed by the equation Q = .71) X RX A, which, whentransposed, takes the form R = Q .7 1) X A Substituting the known quantities, we have 10,000 u 286. .7 X 4 X The horse-power is 10 X .14 = Fan Engines. A simple, quiet-running engine is desirablefor use in connection with a fan or blower. The engine may be citherhorizontal
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