Cyclopedia of heating, plumbing and sanitation; a complete reference work . 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 temp

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Cyclopedia of heating, plumbing and sanitation; a complete reference work . 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/. sine i//£kv

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