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| Number | Title | Issue Date |
| 7360580 | External flue heat exchangers A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger ... | 04/22/2008 |
| 7216696 | External flue heat exchangers A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger ... | 05/15/2007 |
| 7104082 | Dehumidification and temperature control system A space has air humidity and temperature to be regulated. An air handler has a temperature regulation element, a fan and a housing. An inflow manifold has an intake end and an outflow end and a plurality of stubs and a plurality of dampers. An outflow manifold has a... | 09/12/2006 |
| 7066396 | Method and apparatus for enhanced heat recovery from steam generators and water heaters A heating system having a steam generator or water heater, at least one economizer, at least one condenser and at least one oxidant heater arranged in a manner so as to reduce the temperature and humidity of the exhaust gas (flue gas) stream and recover a major port... | 06/27/2006 |
| 7028685 | Air conditioning system for buildings and air-conditioned building, especially a zero energy house A method of air-conditioning a building with low heat loss, having the following steps: providing a fresh-air/outgoing-air system for feeding fresh air through a heat accumulator being located beneath said building and extracting said outgoing air through the heat a... | 04/18/2006 |
| 6979260 | Method and device to prevent indoor release of carbon monoxide and smoke from combustors A device to prevent indoor release of carbon monoxide and smoke from indoor combustors (stoves, furnaces, fireplaces, etc.). The device is based on a discovery that safe operation of indoor burners requires the air pressure in the room housing the burner to be relat... | 12/27/2005 |
| 6908039 | Heat exchange system A heat exchange system and method for heating outside air provided to a structure are disclosed. The system uses and recovers heat from waste products that are being exhausted from the structure. A heated products source generates heated waste products as a result o... | 06/21/2005 |
| 6749014 | External flue heat exchangers A heat exchanger is mounted external to a section of flue pipe or is an integral part of a section of flue pipe. The heat exchanger preheats a domestic hot water supply and boosts the return water temperature prior to reentry to the furnace coil. The heat exchanger ... | 06/15/2004 |
| 6742516 | Ventilation system and method A balanced building ventilation system that employs a fireplace as an element of the ventilation system. The fireplace includes a firebox, and an exhaust gas flue is connected to the firebox for exhausting gas from the firebox to the outdoor ambient. A ventilation c... | 06/01/2004 |
| 6729551 | Fireplace make-up air heat exchange system The need to maintain the quality of air in a home has become more of a problem in new high efficiency tight houses so that governmental regulations are being proposed for a minimum change of fresh air. If too much cold outside fresh air is introduced into such homes... | 05/04/2004 |
| 6598599 | Hot air space heater An object of the present invention is to provide a hot air space heater that is capable of blowing hot air out of a whole wide hot air outlet provided at a front plate of a frame of the heater while making the heater smaller in depth. A burner is arranged... | 07/29/2003 |
| 6572370 | Heat regulating unit A forced air heating system has a heat regulating unit assembled therewith, the heating system comprising a furnace having fuel burner and a flue pipe for outlet gases. The heat regulating unit has a metal flue conduit with a flue gas inlet and a flue gas... | 06/03/2003 |
| 6550687 | Heat exchange system A heat exchange system and method for heating outside air provided to a structure are disclosed. The system uses and recovers heat from waste products that are being exhausted from the structure. A heated products source generates heated waste products as... | 04/22/2003 |
| 6367703 | Heat recovery system A heating system for a building that includes a furnace having a water jacket surrounding a burner unit. Heated water is circulated from the water jacket to a heat exchange system in the building such as radiators and the water is returned to the water ja... | 04/09/2002 |
| 6014966 | Heat transfer unit for a furnace exhaust vent A heat exchange device for harnessing heat from an exhaust vent is provided including a furnace having a main inlet for receiving cooled air suctioned from a living area, a heating mechanism for heating the cooled air suctioned from the living area, a mai... | 01/18/2000 |
| 5423374 | Heat exchanger for flue gas An improved heat exchanger containing a hollow cylindrical pipe casing having a plurality of apertures formed on the surface. A lower elbow pipe is secured to a stove outlet pipe and to the hollow cylindrical pipe casing. The lower elbow pipe functions to... | 06/13/1995 |
| 5406934 | Heat recovery apparatus for use with a non-high efficiency furnace A heat recovery apparatus for increasing the efficiency of a furnace having a cold air return, a burner, a hot air outlet, and a hot air exhaust. The heat recovery apparatus comprising a finned coiled heat exchanger located in the exhaust and having a wat... | 04/18/1995 |
| 5385299 | Fresh air intake system for a dwelling having central forced warm air heating In a dwelling having a forced warm air type central heating system in which the source of heat is the hot gas products of combustion in a furnace, ambient fresh air is introduced into the dwelling to improve the quality of air in the dwelling by a fresh a... | 01/31/1995 |
| 5305954 | Heating systems A heating system comprises an oven located above a solid fuel stove, a chimney for receiving combustion gases from the solid fuel stove, and a heat exchanger in the chimney for transferring heat from the combustion gases to a flow of water. A heat exchang... | 04/26/1994 |
| 5267552 | Direct vent gas fireplace A direct vent gas fireplace has a firebox surrounded by an enclosure. The enclosure has an inclined surface between the top, rear and sides. The surface is inclined at approximately 45 degrees and has an exhaust opening. The firebox has an inclined surfac... | 12/07/1993 |
| 5224650 | Fireplace furnace heating system A fireplace furnace heating system for a structure having a firebox for combustion of fuel, preferably coal. A heating unit is disposed proximately to, and preferably surrounds the firebox. Conduits carry interior air from remote locations to the heating ... | 07/06/1993 |
| 5046481 | Heating apparatus Heating apparatus for heating an environment comprises one or more heat exchange conduits (A, B, C, D, E, F, 6, 8) located in the flow path of primary heated fluid (F1-F2), and a device (4) for inducing a flow of air in each conduit, each conduit being ad... | 09/10/1991 |
| 4938172 | Supplement system for transferring heat from a furnace exhaust stack to a hot water tank A supplementary hot water heating system which transfers to a hot water tank heat from exhaust gas in the furnace stack which would otherwise be wasted. When the water in the supplementary heater core is heated to a desired temperature, normally closed va... | 07/03/1990 |
| 4928667 | Gas fire heating unit A gas fire space heater which can be an insert for an existing fireplace or a free standing unit is described. The device consists of a gas burner with radiants disposed within a housing. The products of combustion are collected in a first plenum, directe... | 05/29/1990 |
| 4903615 | Atmospheric gas heating unit with external recycling of exhaust gas to reduce nOx An improved burner head for a forced air furnace is disclosed which includes a burner tube fitted with gas nozzles, air flow openings, and a flame tube. At least one radial opening is provided between the end of the burner tube and an end of the flame to ... | 02/27/1990 |
| 4892045 | Condensate drain system A condensate drain system for a furnace incorporates a collector and blower housing assembly mounted above a secondary condensing heat exchanger with condensate ports between the blower housing and the collector housing positioned to assure flow of all co... | 01/09/1990 |
| 4887586 | Heat recovery apparatus Apparatus utilizing waste heat from a furnace or the like to heat water for any desired purpose or to supplement a conventional heating system. In its illustrative embodiment, the invention provides a heat recovery device adapted to be interposed as a uni... | 12/19/1989 |
| 4884556 | Zero clearance fireplace A prefabricated zero clearance fireplace includes a combustion chamber having a front opening, a glass door sized and shaped for positioning over and sealing the opening and a guide system for guiding vertical movement of the door between a lowered positi... | 12/05/1989 |
| 4854381 | Heat exchanger device A unique heat exchanger device which is mounted in the flue of a forced air furnace is disclosed. A plurality of copper tubes are retained in a substantially parallel and equidistant relationship by means of end plates. A plurality of circular metallic fi... | 08/08/1989 |
| 4834285 | Heating and ventilating system A heating and ventilating system has a space heating device, in which heat is generated by combustion of a fuel, and which heats air for a building. A heat exchanger has one side through which exhaust air from the building flows to the exterior. Through t... | 05/30/1989 |
| 4773589 | Heat control systems Improvements in fireplace systems include several features some of which are separably usable in other heating apparatus. The features include a barometric damper adaptor, a grate structure, a manner of mounting hollow grate tubes in a fireplace assembly,... | 09/27/1988 |
| 4753178 | Process and means for drying smoke or fumes prior to discharge A process and apparatus for removing moisture from smoke produced in a chemical reaction, such as a combustion reaction, by circulating outside air in heat-exchange relationship with smoke at a point near the chamber where the smoke is produced, thereby h... | 06/28/1988 |
| 4753219 | Reflective heat conductor A reflective heat conductor is presented in the form of a grill having a plurality of individual cells bounded by reflective bare metal surfaces. The grill has an arcuate shape complementary to the object, such as a stovepipe, on which it is located. Heat... | 06/28/1988 |
| 4751910 | Flue gas/combustion air heat exchanger A flue gas/combustion air heat exchanger for a furnace. The furnace includes a combustion chamber that burns a mixture of fuel and combustion air to produce heat for a comfort zone. The resulting products of combustion, along with any waste heat not trans... | 06/21/1988 |
| 4736730 | Heating system A heating system comprising a firebox defining a combustion chamber that is substantially sealed from the atmosphere. The system includes a flue for conducting combustion gases from the combustion chamber. A first duct surrounds the flue and defines an in... | 04/12/1988 |
| 4735130 | Fresh air make-up apparatus Fresh air make-up apparatus for a furnace located in an enclosed building comprises an elongated diffuser housing positioned adjacent the furnace, with the housing having an inlet in communication with fresh outside air and a pair of outlets, one being co... | 04/05/1988 |
| 4730771 | Air duct This invention provides a device for meeting the demand of a forced-air furnace for make-up air in a building, the make-up air being available from a duct leading from outside the building. The device takes warm air from the hot air plenum of the furnace ... | 03/15/1988 |
| 4717402 | Air purification system An air purification system for use with an air conditioning apparatus which includes an air circulation system having supply air flow to a given area and return air flow for drawing air from that area. The air purification system includes an inlet and an ... | 01/05/1988 |
| 4712515 | Device for evacuating into the ambient air combustion products from a condensation boiler A device for evacuating into the ambient air combustion products from a condensation boiler, in which at least one downstream section of the conduit for evacuating the combustion products is coaxial to the conduit for admission of the combustion air neces... | 12/15/1987 |
| 4706884 | Hot air heating system A hot air heating system utilizing the otherwise wasted heat and water vapor in the gases of combustion to pre-heat air supplied to the combustion unit. The hot combustion gases discharged from the combustion unit are mechanically induced by a blower to p... | 11/17/1987 |
