Cyclopedia of heating, plumbing and sanitation; a complete reference work . ouse work we may assume average velocities throughthe vent Hues, as follows: 1 si floor, 3 in feel per ,. 280 3rd , 220 Where flue sizes are based on these velocities, it is well to guardagainst down drafts by placing an aspirating coil in the flue. Asingle row of pipes across the flue as shown in Fig. 69, is usuallysufficient for this purpose when the flues are large and straight; Steam Return Fig. 67 Loop ol Steam Pipe to be Run Inside for Drainage and Air-Venting. 94 HEATING AND VENTILATION
Cyclopedia of heating, plumbing and sanitation; a complete reference work . ouse work we may assume average velocities throughthe vent Hues, as follows: 1 si floor, 3 in feel per ,. 280 3rd , 220 Where flue sizes are based on these velocities, it is well to guardagainst down drafts by placing an aspirating coil in the flue. Asingle row of pipes across the flue as shown in Fig. 69, is usuallysufficient for this purpose when the flues are large and straight; Steam Return Fig. 67 Loop ol Steam Pipe to be Run Inside for Drainage and Air-Venting. 94 HEATING AND VENTILATION 85 otherwise, two rows should be provided. The slant height of theheater should be about twice the depth of the flue, so that the areabetween the pipes shall equal thefree area of the Hue. Large vent fines of this kindshould always be provided withdampers for closing at night, andfor regulation during strong winds. Sometimes it is desired to movea given quantity of air through aflue which is already in XXIY shows what velocitiesy be obtained through flues of. Section Showing Simple Formof Protecting in•<»ii for Vent Car-ried through Roof. Ill different heights, for varying dif-ferences in temperature between theoutside air and that in the flue. Example.—It is desired to discharge 1,300 cubic feet af air per minutethrough a flue having an area of 4 square feet and a heighl of 30 feet. If thecflicicncy of an aspirating eoil is 400 B. T. 1., how many square feet of surfacewill be required to move this amount of air when the temperature of the roomis 70° and the outside temperature is 60°? \//£\A/
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