US 5,307,801 AGranted

Zero clearance fireplace

AssigneeWolf Steel Ltd.

InventorsWolfgang Schroeter, Clifford Lilley

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Abstract

A fireplace comprises a firebox which has a flue and front, bottom, top, rear and side panels. An outer casing is spaced from and surrounds the firebox. A combustion air plenum is positioned at a point above the bottom of the firebox and is connected to a conduit that communicates with a source external to the room in which the fireplace is situated for supplying combustion air to the fireplace. The firebox has a combustion air entry port in at least one of side panels of the firebox near the bottom of the firebox for supplying combustion air to the interior of the firebox. The combustion air port communicates with the combustion air plenum through a first passage. The flue passes upwardly through the firebox and is adapted to be connected to a second conduit that is in communication with a source external to the room which the fireplace is situated for exhausting the combustion gasses from the fireplace. A second passage is provided between the outer casing and the firebox for circulation of air to be heated along the firebox.

Claims18

Dependent claims

A fireplace comprising:

(a) a firebox having a front, a bottom panel, a top panel, two side panels, a rear panel and a flue;
(b) an outer casing spaced from and surrounding said firebox;
(c) combustion air feed means positioned at a point above said bottom of said firebox adapted for connection to first conduit means which is in communication with a source external to the room in which the fireplace is situated for supplying combustion air to said fireplace;
(d) combustion air entry port means located in at least one of said side panels near said bottom of said firebox for supplying combustion air to the interior of said firebox;
(e) first passage means positioned between said side panels of said firebox and said outer casing and connecting said combustion air feed means and said combustion air entry port means;
(f) connection means positioned on said flue and adapted for connecting said flue to second conduit means in communication with a source external to the room in which the fireplace is situated for exhausting the combustion gas from the fireplace;
and,
(g) second passage means positioned between said outer casing and said firebox for circulation of air to be heated along said firebox;
wherein said combustion air travels along said sides of said firebox in said first passage means such that only said air to be heated travels along, and is adjacent to, said rear panel of said firebox.

6 more elements

A fireplace comprising:

(a) a firebox having a front, bottom panel, a top panel, two side panels, a rear panel and a flue;
(b) an outer casing spaced from and surrounding said firebox;
(c) a lower plenum positioned between said bottom panel of said firebox and said outer casing, a rear plenum positioned between said rear panel of said firebox and said outer casing and an upper plenum positioned between said top panel of said firebox and said outer casing, said rear plenum being in communication with both said upper plenum and said lower plenum and each of said upper and lower plenums being in communication with said room in which said fireplace is located to define a passage for room air to travel around the fireplace;
(d) combustion air feed means positioned above said rear panel of said firebox and adapted for connection to first conduit means which is in communication with a source external to the room in which the fireplace is situated for supplying combustion air to said fireplace;
(e) combustion air entry port means located in each of said side panels near said bottom of said firebox for supplying combustion air to the interior of said firebox;
(f) first passage means positioned between said side panels of said firebox and said outer casing and connecting said combustion air feed means and said combustion air entry port means, said first conduit means, said combustion air feed means, said first passage means and said combustion air entry port means all positioned above said bottom panel of said firebox such that combustion air is supplied to said firebox under gravity flow;
(g) connection means positioned on said flue and adapted for connecting said flue to second conduit means in communication with a source external to the room in which the fireplace is situated for exhausting the combustion gas from the fireplace;
wherein said combustion air travels along said sides of said firebox in said first passage means such that only said air to be heated travels along, and is adjacent to, said rear panel of said firebox.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/921,774Filed 30 Jul 1992
Priority: CA 20734118 Jul 1992
Granted: 3 May 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F24B 1/1888
The heat exchange medium being air only: with forced circulation
F24B 1/1802
Stoves with open fires, e.g. fireplaces: adapted for the use of both solid fuel and another type of fuel or energy supply
F24B 1/1808
Stoves with open fires, e.g. fireplaces: simulated fireplaces
F24B 1/181
Stoves with open fires, e.g. fireplaces: free-standing fireplaces, e.g. for mobile homes ; Fireplaces convertible into stoves