Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 114. Combined Heater and Centrifugal Fan with Direct-Connected Fig. 115. Centrifugal Fan in -Three-Quarter Housing. Used where Headroom isLimited; Extra Space Provided by Pit under Floor-Level. 172 HEATING AND VENTILATION 103 Fans arc made both with double and with single inlets, theformer being called blowers and the latter exhausters. The size ofa fan is commonly expressed in inches, which means the approximateheight of the casing of a full-housed fan. The diameter of the wheelis usually expressed in fe
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 114. Combined Heater and Centrifugal Fan with Direct-Connected Fig. 115. Centrifugal Fan in -Three-Quarter Housing. Used where Headroom isLimited; Extra Space Provided by Pit under Floor-Level. 172 HEATING AND VENTILATION 103 Fans arc made both with double and with single inlets, theformer being called blowers and the latter exhausters. The size ofa fan is commonly expressed in inches, which means the approximateheight of the casing of a full-housed fan. The diameter of the wheelis usually expressed in feet, and can be found in any given ease bydividing the size in inches by 20. For example, a 120-inch fan has awheel 120 -*- 20 = 6 feet in diameter.
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