, induced draft gas heaters
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United States of America Patent
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Sep 8, 2015
Grant Date -
Dec 22, 2011
app pub date -
Jun 22, 2011
filing date -
Jun 22, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An improved induced draft gas burner assembly for low NOx residential and light commercial gas furnaces is disclosed. The improved burner includes an upstream assembly coupled to a fuel inlet and an air inlet. The air inlet is coupled to a neck extending between the air inlet and the outlet of the neck, both of which may be disposed within an optional chamber. If used, such a chamber also includes an outlet coupled to a burner. In practice, the chamber and neck behave as a Helmholtz resonator that can be tuned to provide an upstream impedance Zup that exceeds the downstream impedance Zdown of the components downstream of the burner assembly.
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