Apparatus and method for sound reduction of high efficiency furnaces
AssigneeLennox Industries Inc.
InventorsLeonor BEAKLEY, Leonard J. COOK, David CHILSON
Life of this patent
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Abstract
A sound level reducing apparatus and method for reducing the outdoor sound level produced by a high efficiency gas furnace. The apparatus comprising a muffler having an internal length determined by an identified target pure tone frequency producing an undesirable sound level. The internal length may be optimized to reduce the sound level across a range of operational frequencies.
Claims20
A muffler for a high efficiency gas furnace, comprising:
- a first end cap connected to a shell;
- a second end cap connected to the shell;
- a first connecting pipe connected to the first end cap;
- a second connecting pipe connected to the second end cap, where the first connecting pipe is spaced a distance from the second connecting pipe;
- a tubular shaped wire mesh connected to the first connecting pipe and connected to the second connecting pipe;
- a tubular shaped insulation concentrically wrapped around and abutting the wire mesh;
- and
- wherein the distance is determined by a targeted frequency produced by the high efficiency gas furnace.
A high efficiency gas furnace, comprising:
- a heat exchange assembly connected to a burner assembly;
- a draft inducer assembly connected to the heat exchange assembly;
- a flue extending from the draft inducer assembly connected to a vertically oriented muffler, and
- wherein the muffler has a length determined by a targeted frequency produced by the draft inducer assembly.
A method for reducing an outdoor sound level of a high efficiency gas furnace produced at a target pure tone frequency, comprising:
- identifying the target pure tone frequency;
- calculating an interior length dimension of a muffler from the target pure tone frequency;
- and
- connecting the muffler having the calculated interior length dimension to a flue of the high efficiency gas furnace.
Dependencies are inferred from the claim text.