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GAS BOILER* PARTICULARLY BOILER FOR CENTRALIZED HEATING SYSTEM
GAS BOILER* PARTICULARLY BOILER FOR CENTRALIZED HEATING SYSTEM
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机译:集中供热系统的燃气锅炉*
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摘要
Gas-burning boilers have in a chamber a plurality of finned heat-exchange tubes arranged around a central gas burner which is substantially of the same length as the finned tubes. An extraction fan draws gases from the chamber such that the chamber works under sub-atmospheric pressure which is preferably 12 mm water column or more below atmospheric.
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