Furnace vent with water-permeable inner pipe
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United States of America Patent
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Aug 11, 2015
Grant Date -
Oct 13, 2011
app pub date -
Mar 1, 2011
filing date -
Apr 9, 2010
priority date (Note) -
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Abstract
A vent system for improving the efficiency and/or reducing emissions of a combustion device is disclosed. The vent system may include an outer pipe and an inner pipe having a longitudinal section that is permeable to water or water vapor and is longitudinally disposed within the outer pipe. The inner pipe defines a first passageway and the outer and inner pipes define a second passageway therebetween. As the moisture and/or heat are transferred from the flue gas to the intake air through the longitudinal section of the inner pipe, the efficiency of the furnace may be improved and the NOx emission of the furnace may be reduced.
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