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7575178 |
Heat recovery apparatus
An apparatus for extracting heat from a heat source comprising a housing having a first end with a first opening and a second end with a second opening. The housing includes an internal compartment...
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7575001 |
Solar and heat pump powered electric forced hot air hydronic furnace
A furnace and method using a heat pump for providing domestic hot water and forced hot or cooled air utilizing heat pump achieved efficiency levels in an on-demand and unlimited domestic hot water,...
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7360534 |
Heated replacement air system for commercial applications
Apparatus and a method for providing heated replacement air to a paint spray booth or other commercial process which requires heated make-up air to replace exhausted air. A blower draws outside air...
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7337837 |
Air conditioning system
A self-contained, fully-integrated, energy efficient heating and cooling system or apparatus for conditioning the air on the interior of a building which includes a means for creating airflow...
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7114553 |
Air conditioning system
A self-contained, fully-integrated, energy efficient heating and cooling system or apparatus for conditioning the air on the interior of a building which includes a means for creating airflow...
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7101172 |
Apparatus and methods for variable furnace control
A furnace control system for controlling a gas-fired induced-draft furnace having a variable speed inducer blower. A control apparatus, responsive to a signal corresponding to the magnitude of a...
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7100597 |
Modular burner/blower system and method
A modular burner/blower system and method directed to an independently operable direct fired burner unit and an independently operable blower unit that are also configured to be interconnected to...
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7096933 |
Furnace heat exchanger
A furnace heat exchanger with multiple parallel flow passages wherein the last flow passage extends downwardly from its plane as it approaches the outlet so as to result in a lower overall height...
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7046918 |
Space heater with pretreated heat exchanger
A space heater with a linear source of infrared radiant energy in heat exchange relationship with a heat exchanger formed of copper or aluminum material. The copper is pretreated to soften the...
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7036498 |
Multi-position furnace
A multi-position furnace is provided that can be positioned for downflow operation, upflow operation, left horizontal flow operation, or right horizontal flow operation without major modifications...
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6945320 |
Tubular heat exchanger with offset interior dimples
A tubular heat exchanger has at least one pair of dimples which are extruded into at least one tube of the heat exchanger by deforming the tube wall inwardly. The dimples of each pair are in...
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6923173 |
Hot air furnace
Disclosed is a high efficiency hot air furnace including a heat exchanger assembly located in a heat exchange chamber through with comfort air is passed to be heated. The heat exchanger assembly...
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6889686 |
One shot heat exchanger burner
A single burner, heat exchanger combination for particular use in a hot air furnace, includes a plurality of spaced heat exchangers, each heat exchanger having an inlet port for receipt therein of...
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6880548 |
Warm air furnace with premix burner
A warm air furnace system has a valve for controlling the flow of fuel, and a mixing component for receiving fuel from the valve and mixing the fuel with air to form an air-fuel premix. The warm...
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6851469 |
Air baffle attachment to a heat exchanger
A clamshell heat exchanger panel has a pocket formed in an edge of a land portion of the panel so that a fastener can be inserted into the pocket, with its axis in the plane of the heat exchanger...
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6793015 |
Furnace heat exchanger
A furnace heat exchanger with multiple parallel flow passages wherein at least one flow passage has a cross-sectional shape which transitions from one form to another in a gradual manner so as to...
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6779823 |
All-weather street and road maintenance vehicle
A vehicle with a self-contained cooling and heating capability and a tenting feature for sheltering and controlling the temperature at a given location. Warm air is directed out of a heat chamber...
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6769425 |
Fuel-fired furnace with combustion air-cooled draft inducer fan motor
A fuel-fired, forced draft air heating furnace has a draft inducer fan disposed in a vestibule chamber having an exterior wall with an air intake opening therein. During operation of the draft...
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6758208 |
Flexible gas-fired heat exchanger system
A compact, highly flexible and efficient, multi-positionable, multi-dimensional and multi-stage gas-fired heat exchanger system as described. The system is connectable in a forced air duct...
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6732728 |
Air baffle for a heat exchanger
The invention is applicable to a furnace having a plurality of parallel, multi-pass pass heat exchanger panels that are susceptible to the occurrence of hot spots at a specific location. A baffle...
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6698506 |
Fan housing heat exchanger
Herein presented is a unique device for air delivery and heat transfer. The housing assembly with the integrated heat exchanger chambers of the device along with a gas train assembly, a draft fan...
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6684878 |
Condensate drainage system for an outdoor condensing furnace
An outdoor condensing furnace is provided with a condensate drain line which passes through the heat exchange compartment and to a location within the building where it can be discharged at...
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6675795 |
Freeze resistant method for draining furnace condensate in low temperature environments
A freeze resistant method for draining liquid condensate from a condensate furnace includes quickly purging the liquid condensate from a condensate reservoir. A condensing heat exchanger connected...
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6564794 |
Heat exchanger air baffle diverter vane
In a furnace having a plurality of parallel heat exchanger panels over which circulation air is caused to flow, and which has a tendency for hot spots to occur at particular locations on its...
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6561182 |
Water heater, steam generator and gas burner therefor
A hot water boiler and/or hot steam generator as well as a gas burner and a water vessel for the hot water boiler and hot steam generator are disclosed. The water boiler or hot steam generator...
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6543438 |
Furnace with dual use inducer motor
An improved furnace including a two-speed inducer motor which can be used as a single speed motor for either a vertically or horizontally vented furnaces. The inducer has a common terminal, a low...
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6536378 |
Apparatus for evacuating condensation from furnace pipe systems
An apparatus for evacuating liquid condensation from pipe systems which is particularly applicable to exhaust pipe systems in high efficiency furnaces. The apparatus forms a junction sleeve between...
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6497570 |
Gas control assembly
A gas control assembly for a forced air furnace which includes a support frame having a top surface and two contiguous side walls which define an enclosure. A planar one piece burner assembly which...
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6494199 |
Multipoise furnace cabinet
A multipoise furnace cabinet includes right and left sides with top and bottom plates connecting upper and lower parts of the right and left sides together. In one embodiment, top and bottom plates...
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6491514 |
Furnace burner box assembly with reduced acoustic emissions
A burner box assembly for a combustion air furnace includes a back wall, opposed side walls and top and bottom walls defining an interior space for one or more burner nozzles. A combustion air...
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6484798 |
Furnace heat exchanger
A multipass heat exchanger with return bends between passes has its first return bend which varies in cross sectional area in the direction of the of the gas flow. The cross sectional area first...
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6474329 |
Cell panel for furnace
A one piece cell panel for a forced air furnace which is designed for ease of removal without the necessity of having to dismantle the furnace cabinet. The panel includes a substantially vertically...
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6474328 |
Heater unit
A heater unit for air handling equipment comprises a peripheral frame 2 across which a plurality of heater tubes 12 extend. The heater tubes 12 have reverse bends, and each extends from an...
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6422306 |
Heat exchanger with enhancements
A heat exchanger for use with a furnace, each heat exchanger includes a plurality of heat exchanger elements. Each heat exchanger element includes a pair of clamshells sealingly attached to one...
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6390806 |
Pneumatic system for flame rollout and draft safeguard protection
A furnace is provided with a flame rollout protection system which operates through an existing excess-air control pneumatic circuitry to shut down the furnace in the event of a flame rollout...
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6382203 |
Furnace with combustion air-cooled draft inducer fan
A fuel-fired, forced draft air heating furnace is provided with a draft inducer fan structure which substantially reduces the operational noise of the furnace. The draft inducer fan is disposed...
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6318358 |
Furnace blower with double sided impeller
A blower for a furnace is provided where the blower has an impeller that is configured to create a primary air flow of combustion air into the blower housing and a secondary air flow of cooling air...
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RE37389 |
Appliance for improved venting
A gas appliance, flue assembly, or vent adapter including an adjustable flow regulator which regulates the proportions and volume of dilution air and combustion products into the vent is disclosed....
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6286501 |
Humidifier system
A humidifier for adjusting the humidity level in a building, the humidifier having a heat exchange tube adapted to be heated by a furnace as the furnace heats air to be circulated through the...
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6283115 |
Modulating furnace having improved low stage characteristics
An improved, induced-draft, gas-fired furnace which is adapted to operate at any of a high, medium and low firing rate. A pressure sensing assembly generates differential pressure signals that vary...
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6234164 |
Intake and discharge tube closure detector for combustion device of forced intake and discharge type
An orifice is disposed in an intake tube for developing a pressure difference across the orifice, i.e., portions of the intake tube which are positioned upstream and downstream of the orifice. An...
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6227191 |
Method and apparatus for adjusting airflow in draft inducer
A bypass hole is cut into a collector box cover to reduce the efficiency of a draft inducer fan when the fan is used with a furnace containing fewer burner-heat exchanger cells than the fan is...
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6223740 |
Fuel-fired furnace with self-cooling draft inducer fan
A gas-fired forced draft air heating furnace is provided with a specially designed self-cooling draft inducer fan that overlies an inshot-type burner section of the furnace and is operatively...
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RE37128 |
Standing pilot furnace with vented vestibule
An induced draft, fuel-fired furnace having a heat exchanger with an inlet and an outlet includes a vent having an inlet, a burner, and a vented vestibule in fluid communication with the vent. A...
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RE37009 |
Enhanced tubular heat exchanger
The present invention is an enhanced tubular heat exchanger for a furnace with the heat tubes of the heat exchanger having two straight sections connected by a bend . The tubes of the heat...
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6161535 |
Method and apparatus for preventing cold spot corrosion in induced-draft gas-fired furnaces
A method and apparatus for increasing the circulating airflow of induced-draft, gas-fired multi-stage furnaces without creating conditions that result in cold spot corrosion therein. Control...
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6152128 |
Easily-assembled portable forced-air heater with reduced number of components
A portable forced air heater includes a one-piece unichassis structure which forms the base and the outer housing of the heater. The outer housing defines an elongated passage having a front end...
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6145501 |
Low emission combustion system
A burner system for a furnace (10) includes an in-shot burner (20) having an axially elongated tubular nozzle (40) having an inlet end (42), an outlet end (44) and a venturi transition section (46)...
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6126436 |
Sound enhancing burner enclosure for furnace
An enclosure surrounding the burner of a furnace, including a top panel, a rear panel, a bottom panel, a front panel, and first and second side panels. An air inlet is provided in one of the...
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6112741 |
Mid-efficiency furnace with multiple venting option
A multi-category gaseous fuel-fired heating apparatus having a combustion chamber, a mixing chamber in fluid communication with the combustion chamber, and an induced draft blower in fluid...
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