Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 15i. Horizontal Engine for Fan Use. Area of Ducts and Flues. With the blower type of fan, the sizeof the main duets may be based on a velocity of 1,200 to 1,500 feet perminute; the branches, on a velocity of 1,000 to 1,200 feet per minute,and as low as GOO to 800 feet when the pipes are small. Flue veloci-ties of 500 to 700 feet per minute may be used, although the lowervelocity is preferable. The size of the inlet register should be suchthat the velocity of the entering air will not exceed about 300 feet perminut
Cyclopedia of heating, plumbing and sanitation; a complete reference work . Fig. 15i. Horizontal Engine for Fan Use. Area of Ducts and Flues. With the blower type of fan, the sizeof the main duets may be based on a velocity of 1,200 to 1,500 feet perminute; the branches, on a velocity of 1,000 to 1,200 feet per minute,and as low as GOO to 800 feet when the pipes are small. Flue veloci-ties of 500 to 700 feet per minute may be used, although the lowervelocity is preferable. The size of the inlet register should be suchthat the velocity of the entering air will not exceed about 300 feet perminute. The velocity between the inlet windows and the fan orheater should not exceed about 800 feet. The air-ducts and flues are usually made of galvanized iron, the 188 HEATING AND VENTILATION 179. Fig. 155. Adjustable Deflector Placer] at Forkof Pipe to Regulate Air-Supply. ducts being run at the basement ceiling. No. 20 and No. 22 ironis used for the larger sizes, and No. 24 to No. 2S for the smaller. Regulating dampers shouldbe placed in the branches lead-ing to each flue, for increasing orreducing the air-supply to thedifferent rooms. Adjustable de-flectors are often placed at thefork of a pipe for the same pur-pose. One o* these is shown inFig. 155. Fig. 150 illustrates a com-mon arrangement of fan andheater where the type of heatershown in Fig. 138 is used; andFig. 157 is a self-contained apparatus in which the heater is inclosedin a steel casing. Factory Heating. The application of forced blast for thet cold ai*i ,NL^r widows warming of factories and f 1 T11 shops, is shown in and 159. The pro-portional heating surfacein this ease is generallyexpressed in the numberof cubic feet in thebuilding for each linearfoot of 1-inch steampipe in the heater. ()nthis basis,
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