# US 4,397,292 A · Circulating air space heater

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- Number: US 4,397,292 A
- Document ID: US4397292A
- Status: Granted
- Kind: A
- Application number: 06/310,273
- Filed: 1981-10-09
- Granted: 1983-08-09
- Earliest claimed: 1981-10-09
- Inventors: Francis Mitchell
- Web page: https://patentgrep.com/patent/US4397292A

## CPC

- F24B 7/00: Stoves, ranges or flue-gas ducts, with additional provisions for convection heating (stoves with open fires characterised by use of heat exchange means F24B1/188)
- Y10S 165/901: Heat savers
- F24B: DOMESTIC STOVES OR RANGES FOR SOLID FUELS (for solid fuels in combination with gaseous fuels, liquid fuels or other kinds of energy supply F24C1/02); IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A solid fuel burning modular stove fabricated from a plurality of metal assemblies includes a first assembly provided with a combustion chamber, an air duct at the lower front of the chamber communicating with the ambient air, a louver member inside the air duct varying the degree of admittance of air through the duct, flue pipe means for exhausting combustion products from the stove, a plurality of fire brick lining the floor, rear and side walls. Vertical ducts are positioned along the rear and side walls having inlet openings at their bottom and outlet openings at their tops, heated air rises through the ducts and discharges into the ambient air. A second assembly to be attached to the bottom of the first assembly comprising horizontal channel means in communication with the vertical duct inlets providing a blower to force outside air through the vertical ducts. A third assembly comprising generally horizontal channel means to be attached to the top of the first assembly in communication with the vertical duct outlets for conducting heated air to a reclaimer chamber in heat exchanging relationship with the flue pipe. The blower, and the louver member may be controlled by an electric thermostat providing except for the introduction of fuel a fully automatic forced air heating system.

## Claims

### Claim 1

A stove for burning solid fuel fabricated from a plurality of sheet metal modular assemblies comprising:
(a) a first assembly comprising a combustion chamber with sheet metal top, floor, front, rear and a pair of oppositely disposed side walls, an air duct at the lower front of said first assembly for conducting outside air into said stove, a movable louver member inside said duct varying the degree of admittance of said air through said duct, flue pipe means having one end at a location inside said stove and the other end for exhausting combustion products from said stove,
(a) a plurality of fire bricks lining said floor, said rear, and said side walls,
(c) a plurality of sheet metal spaced vertical ducts positioned along said rear wall and said side walls staggered between said fire bricks lining said rear wall and said side walls extending substantially from the bottom to the top of said rear wall having air inlet openings at the bottom of said vertical ducts to allow air to rise from the bottom through said ducts, and air outlet openings at the top of said vertical ducts to allow said air to discharge into the ambient air,
(d) a second assembly comprising horizontal channel means to be attached to the bottom of said first assembly in communication with said vertical duct inlets, said channel having an inlet provided with blower means for conducting outside air into said vertical ducts,
(e) a pivotally mounted door in the front wall to provide access to the stove for the introduction of wood or other solid fuel.

### Claim 2 (depends on 1)

The stove according to claim 1, wherein a third assembly comprises a generally horizontal channel means to be attached to the top of said first assembly in communication with said vertical duct outlets for conducting heated air from said outlets to the ambient air.

### Claim 3 (depends on 2)

The stove according to claim 2, wherein said third assembly further comprises reclaimer means in heat exchanging relationship with said flue pipe means.

### Claim 4 (depends on 3)

The stove according to claim 3, wherein said reclaimer comprises a chamber subdivided into an air inlet manifold, an air outlet manifold, and a heat exchange subchamber disposed between said inlet and said outlet manifolds, a plurality of horizontal passageways communicating between said inlet and said outlet manifolds, said heat exchange subchamber being provided with an inlet opening at the bottom for combustion products from said first assembly, and an outlet opening at the top for discharge of said combustion products.

### Claim 5 (depends on 1, 2, 3, 4)

The stove according to any one of claims 1, 2, 3 or 4, further comprising electric thermostatically controlled damper motor means for controlling the adjustment of said louver, and also includes electric thermostat control means for the blower means in said second assembly, and fan means in said third assembly.