US 10,801,738 B2Granted

Furnace

AssigneeFire Chief Industries LLC

InventorDanny N. Haynes

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Abstract

A furnace including a housing and a firebox in the housing having a combustion chamber. The furnace includes a combustion air delivery system for delivering combustion air to the combustion chamber. The combustion air delivery system includes a manifold mounted outside the combustion chamber and extending vertically along the front face of the combustion chamber from a lower end to an upper end. An air blower is mounted on the manifold. The combustion air delivery system includes a primary combustion air passage for delivering air from the air blower to a primary combustion air outlet at the front face of the combustion chamber. The combustion air delivery system includes a secondary combustion air passage for delivering air to a secondary combustion air outlet positioned inside the combustion chamber adjacent the top face of the combustion chamber.

Claims18

Dependent claims

A forced-air furnace, comprising:

a housing having a top, a bottom opposite said top, a front, a back opposite said front, and opposite sides extending between said top and said bottom and between said front and said bottom;
a firebox in the housing having a combustion chamber adapted for receiving fuel to be combusted and producing products of combustion, the combustion chamber including a front face adjacent the front of the housing, a rear face opposite the front face, a top face below which the fuel is combusted and a bottom face above which the fuel is combusted;
and
a combustion air delivery system for delivering combustion air to the combustion chamber, the combustion air delivery system including:
a manifold extending vertically along the front face of the combustion chamber from a lower end to an upper end;
an air blower mounted on the manifold for blowing air through the manifold from the lower end to the upper end;
a primary combustion air passage in fluid communication with the lower end of the manifold for delivering air from the air blower to a primary combustion air outlet entering the combustion chamber exclusively at the front face of the combustion chamber adjacent the bottom face of the combustion chamber for delivering primary combustion air to the combustion chamber during combustion, burning the fuel and forming products of combustion, a lower half of the combustion chamber being free of combustion air outlets at the rear face of the combustion chamber;
and
a secondary combustion air passage in fluid communication with the lower end of the manifold for delivering air from the air blower to a secondary combustion air outlet positioned inside the combustion chamber adjacent the top face of the combustion chamber for delivering secondary combustion air to the combustion chamber, burning a portion of the products of combustion.

6 more elements

A forced-air furnace comprising:

a housing having a top, a bottom opposite said top, a front, a back opposite said front, and opposite sides extending between said top and said bottom and between said front and said bottom;
a firebox in the housing having a combustion chamber adapted for receiving fuel to be combusted and producing products of combustion, the combustion chamber including a front face adjacent the front of the housing, a rear face opposite the front face, a top face below which the fuel is combusted and a bottom face above which the fuel is combusted, said firebox having a post-combustion chamber positioned above the combustion chamber, the post-combustion chamber receiving products of combustion from the combustion chamber exclusively adjacent the front face of the combustion chamber and transporting the products of combustion to an exhaust port adjacent a back of the housing;
a lower plenum fluidly segregated from the combustion chamber positioned below the combustion chamber;
a forced-air fan adapted to selectively blow air into the lower plenum;
a pair of passages, each passage of said pair of passages transporting air upward from the lower plenum along a corresponding opposite side of the combustion chamber;
and
an upper plenum fluidly segregated from the post-combustion chamber partially surrounding the post-combustion chamber for transferring heat from the products of combustion in the post-combustion chamber to air travelling through the upper plenum, the upper plenum including lower portions on opposite sides of the post-combustion chamber and an upper portion above the post-combustion chamber having a duct connection port adjacent the rear wall of the housing through which air exits the upper plenum, each of the lower portions of the upper plenum receiving air from a corresponding passage of said pair of passages and directing the received air upward along the corresponding side of the post-combustion chamber to the upper portion, the upper portion directing air from the lower portions of the upper plenum rearward to the duct connection port.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/673,376Filed 9 Aug 2017
Published: US 2019/0049122 A114 Feb 2019
Granted: 13 Oct 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

F24D 19/1084
Arrangement or mounting of control or safety devices: for air heating systems
F23L 1/00
Passages or apertures for delivering primary air for combustion
F23L 9/02
Passages or apertures for delivering secondary air for completing combustion of fuel: by discharging the air above the fire
F23L 9/06
Passages or apertures for delivering secondary air for completing combustion of fuel: by discharging the air into the fire bed