Abstract: Methods and apparatus to indicate presence of a flame are disclosed. An example gas grill includes a burner tube having apertures to emit a fuel for combustion, an ignition element to cause ignition of the fuel emitted from the apertures of the burner tube, a flame sensor to detect the presence of a flame associated with the combustion of the fuel emitted from the apertures of the burner tube, and flame sense circuitry including a flame signal accessor to access a flame sense signal from the flame sensor, and a terminal to output an indication of the presence of the flame, the indication of the presence of the flame output without respect to an open or closed state of a lid of the grill.

Abstract: A combustor assembly for a heat engine is generally provided. The combustor assembly defines a fuel nozzle centerline and a radial direction extended from the nozzle centerline. The combustor assembly includes a fuel nozzle disposed at least partially concentric to the nozzle centerline. The fuel nozzle defines a fuel injection opening. A deflector assembly is defined around the nozzle centerline extended therethrough. The deflector assembly includes a deflector wall extended at least partially along the radial direction. The deflector assembly includes a conical portion defined around the nozzle centerline. The conical portion defines a fuel nozzle opening. A plurality of openings is defined through the conical portion radially adjacent to the fuel injection opening at the fuel nozzle.

Abstract: An exhaust system for exhausting air from appliances in a commercial kitchen is described. The exhaust system comprises an exhaust fan that includes a housing, a motor mounted in the housing, and a fan directly driven by the motor. A motor compartment surrounds the motor. Cooling air is induced into and through the housing and directed into the motor compartment for cooling the motor. Cooling air is discharged from a motor compartment and mixed with exhaust air to form an air mixture that is directed through the housing of the exhaust fan.

Abstract: The present application relates to a reflow soldering oven (1) for soldering an electronic circuit board (300), the oven (1) comprising a gas purification system (11, 21) for purifying gas that contains flux components vaporized from the electronic circuit board (300). The gas purification system further comprises at least one gas purification unit (11, 21) comprising a catalyst unit comprising a catalyst material. The invention further relates to a corresponding reflow soldering method.

Abstract: A gas hot air gun head includes a fuel supply device engagable with a gas reservoir and having a fluid inlet end, a fluid outlet end and a channel extending from the fluid inlet end to the fluid outlet end. Further, a flow-guiding device connects to the fluid outlet end of the fuel supply device and includes a combustor. The combustor connects to the fuel supply device. The combustor includes a combustion chamber extending therethrough. The combustion chamber includes first and second flow-guiding plates engaging therein and separating from each other in an axial direction. The first flow-guiding plate includes a plurality of first holes extending therethrough. The second flow-guiding plate includes a plurality of second holes extending therethrough. A centerline of one of the plurality of first holes offsets from centerlines of the plurality of second holes.

Abstract: A drying installation (1) and method for drying of products (3). More in particular, the invention relates to a drying installation (1) and a method for drying sludge or mud, as e.g. the drying of wastewater and industrial sludge possibly contaminated with toxic or corrosive components. The dryer installation (1) comprises infrared emitters (5) which are protected and/or insulated from the evaporation products (7) exiting the drying product (3).

Abstract: Provided is a portable heater supplied by an associated fuel source, comprising a housing, a fuel connection fitting, an orifice, a burner assembly, a regulator, a controller for selectively switching among operation states including at least a 4000 BTUs and a 9000 BTUs per hour state, a power source adapted to generate electrical power from heat, and a detector system adapted to use the electrical power generated by the power source, detect the level of a particular gas in the atmosphere, and interrupt combustion of the air-fuel mixture. A housing may comprise an air inlet and may define an interior region. A burner assembly may comprise a fuel valve adapted to control communication between the burner assembly and the associated fuel source, a venturi for mixing air and fuel into a fuel-air mixture, a combustion region adapted for the combustion of the air-fuel mixture to produce combustion products and heat.

Abstract: A forced air heater that includes two air moving devices for improved control of air and fuel mixture for combustion, and improved air flow the heater. In addition to better air flow, the heater includes an improved fuel system that utilizes a pump and delivery controls to accommodate reduced air flow while avoiding incomplete combustion and fume odors.

Abstract: A duct burner assembly for a HRSG having a casing that defines a combustion chamber with a liner for communicating an exhaust gas. A firing runner attaches to the liner and extends through the combustion chamber. The firing runner defines a plurality of orifices for emitting combustible gas and sustaining a flame. A flame stabilizer attaches to the firing runner and is configured to at least partially shield the plurality of orifices from the exhaust gas. A guide plate attaches to the firing runner and is configured to define a slot between the liner and the guide plate. The guide plate has an upstream end and a downstream end wherein the downstream end is closer to the lining than the upstream end to reduce turbulent flow of the exhaust gas through the slot and cool the liner.

Abstract: A low pressure forced air heater is provided having a variable speed motor driving a fan and a compressor. An amount of the pneumatic output from the compressor is communicated through an air bleed valve and the remainder is communicated through an air output orifice. The air output orifice is in communication with a fuel nozzle and causes fuel to be drawn from a tank, atomized and combusted in a combustion chamber.

Abstract: The invention relates to a hot air internal ignition burner/generator comprising an injection device used for producing a high-speed fuel gas mixture stream and for injecting said stream into the burner head (2) which is tabular-shaped and comprises in-series arranged therein a pressure recovery chamber (10), an igniting chamber (11) and simple or multiple diffusion means (24) which are fixed inside the head (2), where two chambers are jointed, wherein said diffusion means (24) comprise a central orifice provided with an igniting tube which penetrates therein and axially extends inside the pressure recovery chamber (10) in such a way that it defines the ignition chamber (43) provided with igniting electrodes (42) connected to the pressure recovery chamber (10) of the burner (2) via a calibrated orifice (46).

Abstract: A hot air generator comprising a handle (12), an elongated nozzle (14), flame generating means (6), a venturi (4), a gas conduit (162) intended to bring a combustible gas into the elongated nozzle (14) and at the flame generating means (6), an air conduit (164) intended for bringing compressed air into the elongated nozzle (14) and downstream from the venturi; characterized in that the generator further comprises a servocontrolled pressure regulator (2) controlling a gas pressure (Pd.g) in the gas conduit (162) depending on an air pressure (Pd.a) in the air conduit (164).

Abstract: A hot air blower includes a shell including a fan mechanism, a combustion device, a vane mechanism, and a flame protector disposed therein. The vane mechanism includes a clipping seat and a plurality of guiding vanes extended thereon. The plurality of guiding vanes extend obliquely and prevents the air passing through the vane mechanism from generating turbulence. The clipping seat and the flame protector form a half-closed combustion chamber therebetween. Heat in the half-closed combustion chamber causes a thermal expansion of the air and, thereby increasing a speed and a volume of the air passing the guiding vanes of the vane mechanism. The heated air is discharged from an external flow tube and which controls a heating range of an area of the hot air blower.

Abstract: A heating apparatus can have a sealed combustion chamber. A burner and an air shutter can be within the sealed combustion chamber. An air shutter control can be outside of the sealed combustion chamber. The air shutter control can provide fine tuning adjustment of the air shutter.

Abstract: In certain embodiments, an apparatus for killing pests in an affected area includes a fuel source, a first air inlet configured to receive a first air flow from the affected area, and a second air inlet configured to receive a second air flow from an unaffected area. The system further includes a premix system operable to generate an air-fuel mixture by mixing a fuel flow received from the fuel source with the second air flow received from the second air inlet. The system further includes a burner operable to generate combustion air by combusting the air-fuel mixture. The combustion air is mixed with the first air flow subsequent to combustion to generate a heated air flow, and the heated air flow is discharged into the affected area. The fuel source, the premix system, and the burner are configured for positioning in the affected area.

Abstract: In certain embodiments, an apparatus for killing pests in an affected area includes a fuel source, a first air inlet configured to receive a first air flow from the affected area, and a second air inlet configured to receive a second air flow from an unaffected area. The system further includes a premix system operable to generate an air-fuel mixture by mixing a fuel flow received from the fuel source with the second air flow received from the second air inlet. The system further includes a burner operable to generate combustion air by combusting the air-fuel mixture. The combustion air is mixed with the first air flow subsequent to combustion to generate a heated air flow, and the heated air flow is discharged into the affected area. The fuel source, the premix system, and the burner are configured for positioning in the affected area.

Abstract: Provided is a hot air blower comprising a fuel tank for storing fuel, an air compression pump for sucking air and compressing the air, a pressure regulation valve installed at the air compression pump to reduce the pressure of the compressed air, a burner assembly for receiving the fuel from the fuel tank and the air from the air compression pump, and a combustion chamber for receiving the fuel from the burner assembly and combusting the fuel, wherein the pressure regulation valve includes a high pressure regulation valve and a low pressure regulation valve, and a valve opening/closing means is installed at the low pressure regulation valve.

Abstract: A forced-air heater having a self-contained on-board electric-power supply, a fuel tank, a support, a housing, a combustion chamber, and a motorized fan. The self-contained on-board electric-power supply may have a generator, a photovoltaic component, or some combination thereof. The fuel tank may be adapted to store a first fuel. The combustion chamber may be adapted to generate heat by combusting the first fuel with air. The motorized fan may be adapted to draw in ambient air through an air intake and force the air into the combustion chamber.

Abstract: A gas forced air heater is provided. The gas forced air heater has a housing surrounding a combustion chamber and a blower upstream of the combustion chamber. A burner tube of the gas forced air heater has a fuel inlet in a secondary chamber coupled to the housing and a burner head proximal an air inlet opening of the combustion chamber. An air input orifice into the secondary chamber is provided upstream of the combustion chamber and allows air output from the fan to be communicated into the secondary chamber.

Abstract: A low pressure forced air heater is provided having a variable speed motor driving a fan and a compressor. An amount of the pneumatic output from the compressor is communicated through an air bleed valve and the remainder is communicated through an air output orifice. The air output orifice is in communication with a fuel nozzle and causes fuel to be drawn from a tank, atomized and combusted in a combustion chamber.

Abstract: This invention describes a new device for controlling the radial profile of the temperature of a confined gas stream that is designed to be used as a coolant in an exchanger that is located downstream from said device.

Abstract: A dual fuel vent free gas heater having at least one gas burner with a plurality of gas outlet ports in an upper surface thereof. The gas outlet ports are in flow communication with at least one pilot flame burner. An adjustable fuel injector or at least two fuel injectors feed fuel to the burner providing for introduction of more than one fuel to the burner. Optionally, an oxygen detection system, manual fuel selection control valve, and/or temperature shut off control system may be incorporated into the dual fuel vent free heater.

Abstract: A gas combustion device includes a casing and a combustor accommodated in the casing and including a primary combustion section and a secondary combustion section. The gas combustion device further includes an ejector, an air-blowing device accommodated in the casing. A supply of combustion gas and a supply of air are gathered in the ejector, and the ejector includes a mixing chamber that combustion gas and air is mixed and a wick that the mixture of combustion gas and air is injected into the primary combustion. The air-blowing device includes a fan and a sheath. Further, a heat-resisting protector in which the combustor is accommodated includes a front end including a flame taming portion and at least one vent defined thereon and extending through the wall and allows hot air to flow therethrough.

Abstract: A vertically storable combustion heater having a fuel tank having a generally-cylindrical passage formed in the fuel-tank housing through which an axle extends to support one or more wheels; a heating conduit that is coupled to the fuel tank and includes an outermost shell that is substantially concentric with an inner shell that has a smaller diameter than the outermost shell; a control panel that is connected to the combustion heater to interface with an operator and allows the operator to input instructions governing the operation of the combustion heater; a frame that at least partially encases the heating conduit and fuel tank; a hose having a return curve and nozzle; and a combustion chamber that is defined by the interior periphery of the inner shell.

Abstract: This invention relates to a means of heating a process fluid to elevated temperature thru use of heat resistant particulates as a heat transfer medium. Down-ward flowing particulates, enter the top of a refractory lined containment vessel, and are heated to elevated temperature by direct contact with an up-flowing stream of hot combustion products, generated by side wall burners located at the bottom of the containment vessel. The heated particulate stream is separated from the combustion gas stream at the bottom of the containment vessel and the spent combustion gas is directed to a downstream tubular convection section for heat recovery and for further processing to recover vaporized process fluid, as in the case of liquid feed preheating for delayed coking, or for heat recovery only, as in the case of gas cracking.

Abstract: A device (10) for thermally treating packaged goods by means of a hot air or gas stream (28), particularly for the shrink treatment of film-wrapped goods, such as packs or the like, is disclosed. The device includes a hot gas generator (12) having a gas burner (14) whose combustion products (16) pass into a mixing device (18) via at least one supply opening (38). The mixing device (18) is formed by a channel portion (20) arranged between a conduit portion (22) formed as an inflow area (23) and an outflow area (25), wherein the mixing device (18) comprises at least one opening (32) for supplying the combustion products (16) and for mixing them with the gas stream (26) of the channel portion (20).

Abstract: A gas heater with improved combustion efficiency and a dryer comprising the same are disclosed herein. The gas heater includes a cabinet, a gas tube disposed inside the cabinet to supply a gas into the cabinet, a nozzle provided to the gas tube, a mixing tube disposed to face the nozzle such that air and the gas can be mixed in the mixing tube, and a mixing member provided to the mixing tube to generate a vortex of air flowing into the mixing tube.

Abstract: An elongated generally cylindrical shell of a portable gas forced air unit is provided with a roll cage for protection. A pair of end caps located at each proximate end of the shell are connected by a plurality of roll cage bars extending parallel with the combustion chamber, whereby, the combination of end caps and roll cage bars serve to protect the concentric shell and its internal combustion chamber from damage. The end caps include a plurality of end bumps dimensioned and located to protect the outer extent of the portable unit while being oriented in substantially vertical or horizontal positions, and serve to support the portable unit when in a vertical position on a surface. The portable gas forced air unit is also adapted to be releasably interconnected with similar units.

Abstract: A burner assembly includes a fuel nozzle and an air-fuel mixing cone coupled to the fuel nozzle. Fuel is discharged from the fuel nozzle into a mixing chamber formed in the air-fuel mixing cone. Air passes into the mixing chamber through openings formed in the air-fuel mixing chamber and mixes with fuel to form a combustible air-fuel mixture in the air-fuel mixing chamber.

Abstract: Provided is a hot air blower capable of adjusting an air pressure to an appropriate pressure by simply operating a pressure regulation valve and appropriately adjusting a heating value of the hot air blower. The hot air blower includes a fuel tank for storing fuel, an air compression pump for sucking air and compressing the air, a pressure regulation valve installed at the air compression pump to reduce the pressure of the compressed air, a burner assembly for receiving the fuel from the fuel tank and the air from the air compression pump, and a combustion chamber for receiving the fuel from the burner assembly and combusting the fuel, wherein the pressure regulation valve includes a high pressure regulation valve and a low pressure regulation valve, and a valve opening/closing means is installed at the low pressure regulation valve.

Abstract: A dryer having a gas heater includes: a mixing pipe for mixing gas with air; and a flame holder installed on the mixing pipe, wherein the flame holder has a body placed opposite to a discharge port of the mixing pipe and formed with a through hole part, and a support extended from the body to be mounted to the mixing pipe; the support has a mounting part fastened to the mixing pipe and a fixing part connecting the mounting part and the body; and a width of the fixing part is narrower than a width of the mounting part.

Abstract: A dryer includes a nozzle communicated with a gas pipe for supplying gas; a gas injection passage which is provided in the nozzle and through which the gas is injected; and an air intake passage provided in the nozzle so as to be communicated with the gas injection passage, wherein a cross section of the gas injection passage is smaller than a cross section of the air intake passage.

Abstract: A direct gas-fired burner assembly is disclosed in which a two-stage flame is produced. A gas manifold is attached to two baffles with apertures disposed therein. The apertures are designed such that a fuel rich zone occurs near the manifold, while a lean zone occurs away from the manifold. At high fire, the apertures create a negative pressure zone which draws the gas away from the burner thereby allowing a primary flame to burn. The primary flame in the fuel rich zone ignites a secondary flame in the lean zone. Because a flame is burning throughout the entire combustion zone, the flame does not move out past the baffles, the flame remains smaller and cooler, and a lower output of pollutants is achieved.

Abstract: A portable gas fired heater includes a combustion chamber having an air inlet and an air outlet. A low DC voltage (optionally AC voltage) fan or blower directs air through the combustion chamber so that the air is heated. Preferably, a vortex generator is located between the fan or blower and the combustion chamber such that air entering the combustion chamber swirls. The heater is designed to have a low center of gravity and thus difficult to tip-over. Nevertheless, several safety features are provided including a tip-over switch, thermal coupler, temperature limit switch, and a manual shutoff.

Abstract: The invention relates to a hot air internal ignition burner/generator comprising an injection device used for producing a high-speed fuel gas mixture stream and for injecting said stream into the burner head (2) which is tabular-shaped and comprises in-series arranged therein a pressure recovery chamber (10), an igniting chamber (11) and simple or multiple diffusion means (24) which are fixed inside the head (2), where two chambers are jointed, wherein said diffusion means (24) comprise a central orifice provided with an igniting tube which penetrates therein and axially extends inside the pressure recovery chamber (10) in such a way that it defines the ignition chamber (43) provided with igniting electrodes (42) connected to the pressure recovery chamber (10) of the burner (2) via a calibrated orifice (46).

Abstract: In certain embodiments, a valve assembly includes a housing. The housing can define a first fuel input and a second fuel input. The housing can further define a first flow path, a second flow path, a third flow path, and a fourth flow path. The assembly can include a fluid flow controller configured to selectively permit fluid communication between the first fuel input and either the first flow path or the second flow path, and configured to selectively permit fluid communication between the second fuel input and either the third flow path or the fourth flow path. The assembly can further include a first nozzle member defining an inlet and an outlet. The inlet of the first nozzle member can be in fluid communication with the first flow path. The assembly can further include a second nozzle member defining an inlet and an outlet. The inlet of the second nozzle member can be in fluid communication with the second flow path.

Abstract: In certain embodiments, a valve assembly includes a housing. The housing can define a first fuel intake, a first fuel output, and a second fuel output. The assembly can include a valve member configured to direct fuel from the first fuel intake to either the first fuel output or the second fuel output. The assembly can further include a nozzle having a first portion and a second portion. The first portion of the nozzle can be in communication with the first fuel output, and the second portion of the nozzle can be in communication with the second fuel output. The assembly can include a compartment in communication with the nozzle, and can include one or more air intakes.

Abstract: A gas hot air gun includes a main body, an ignition device, a switch set and a safety switch. The main body includes a blower, a nozzle, a barrel and a handle. A heating chamber and a mixing chamber are on the inner front of the barrel. A gas can is inside the handle. One end of the nozzle is connected to the gas can. The switch set includes a power switch, with the safety switch closing power of the battery set or gas flow under some pre-set conditions. Users press the power switch and have gas spray out from the nozzle into the heating chamber to generate heat. The blower sends hot air in the heating chamber out of the main body. A metal slice, regulating the direction of air, and a catalyst, for avoiding flame extending out of the nozzle area, are inside the heating chamber.

Abstract: A portable heater adapted for use in a recreational enclosure or temporary work enclosure includes a housing having an air inlet on the lower front face. A gas supply is at least partially enclosed by the housing which provides propane to the mouth of a burner venturi located within the housing. Air is drawn through the air inlet and also enters the mouth of the burner venturi. The air and gas are mixed thoroughly as they travel upwardly through the burner venturi. A chimney effect increases fresh air flow velocity into the burner venturi and allows the heater to operate at a reduced fuel gas pressure. Upon exiting the burner venturi, the air/gas mixture is to a plenum and radiant surface where combustion takes place. Any conventional means may be provided to ignite the air/gas mixture in order to cause combustion. The combustion products deflect off a deflector, which is cooled on a rear face by air flow through the housing, which decreases the temperature of the combustion products before exiting an outlet.

Abstract: A direct-air, gas-fired air makeup heating unit is disclosed which provides reduced nitrogen dioxide emissions with a higher temperature rise. The unit includes a combustion chamber with a protective chamber downstream of the combustion chamber. At high firing intensity, the flame exits the combustion chamber and enters the protective chamber. The resulting flame is therefore protected from excess air moving around the combustion chamber, thereby lowering nitrogen dioxide emissions even at such high firing intensities.

Abstract: A gas hot air gun includes a main body, an ignition device, a switch set and a safety switch. The main body includes a blower, a nozzle, a barrel and a handle. A heating chamber and a mixing chamber are on the inner front of the barrel. A gas can is inside the handle. One end of the nozzle is connected to the gas can. The switch set includes a power switch, with the safety switch closing power of the battery set or gas flow of the gas can under some pre-set conditions. Users press the power switch and have gas spray out from the nozzle into the heating chamber to generate heat. The blower sends hot air in the heating chamber out of the main body. A metal slice regulating the direction of air and a catalyst for avoiding flame extending out of the nozzle area are inside the heating chamber.

Abstract: Embodiments of the present invention are directed to a low NOx duct burner or heater for efficiently heating turbine exhaust gases (TEG) in a less polluting manner. In one embodiment, a heater for heating a gaseous stream flowing in a downstream direction through a duct comprises a heating gas supply pipe extending at least partially across the duct. The heating gas supply pipe includes a plurality of spaced-apart gas pipe outlets to discharge a portion of a heating gas into the duct generally in the downstream direction. A flame shield extends from a location at or near the heating gas supply pipe at least partially across the duct. A plurality of gas supply spuds are disposed upstream of the flame shield. The gas supply spuds include a plurality of gas spud outlets to discharge another portion of the heating gas into the duct.

Abstract: A burner (10, 210, 310, 410) including a fuel manifold (12, 212, 312, 412), perforated air-mixing plates (14, 16, 214, 218, 414) coupled to the fuel manifold to define a fuel-air mixing region (22, 473) therebetween above the fuel manifold, and unperforated air-deflector wings (24, 26, 216, 236, 428). Each unperforated air-deflector wing is coupled to one of the perforated air-mixing plates such that each unperforated air-deflector wing extends upwardly from and at an angle to the perforated air-mixing plate to which it is coupled.

Abstract: A portable griddle stove has two non-stick cooking surfaces, either of which can withstand being on the underside of the cooking surface in use and the heat applied to the underside surface. A heat shield and heat diffuser control the temperature applied to the underside of the cooking surface by providing radiant heat to the center portion of the cooking surface and cooling the combustion gas diffused to the perimeter of the cooking surface. Secondary air provided through openings in case the and heat shield assist in cooling the combustion gas.

Abstract: A portable heater adapted for use in a recreational enclosure or temporary work enclosure includes a housing having an air inlet on the lower front face. A gas supply is partially enclosed by the housing which provides propane to the mouth of a burner venturi located within the housing. Air is drawn through the air inlet and also enters the mouth of the burner venturi. The air and gas are mixed thoroughly as they travel upwardly through the burner venturi. A chimney effect increases fresh air flow velocity into the burner venturi and allows the heater to operate at a reduced fuel gas pressure. Upon exiting the burner venturi, the air/gas mixture is to a plenum and radiant surface where combustion takes place. Any conventional means may be provided to ignite the air/gas mixture in order to cause combustion. The combustion products deflect off a deflector, which is cooled on a rear face by air flow through the housing, which decreases the temperature of the combustion products before exiting an outlet.

Abstract: A portable heater adapted for use in a recreational enclosure or temporary work enclosure includes a housing having an air inlet on the lower front face. A gas supply is partially enclosed by the housing which provides propane to the mouth of a burner venturi located within the housing. Air is drawn through the air inlet and also enters the mouth of the burner venturi. The air and gas are mixed thoroughly as they travel upwardly through the burner venturi. A chimney effect increases fresh air flow velocity into the burner venturi and allows the heater to operate at a reduced fuel gas pressure. Upon exiting the burner venturi, the air/gas mixture is to a plenum and radiant surface where combustion takes place. Any conventional means may be provided to ignite the air/gas mixture in order to cause combustion. The combustion products deflect off a deflector, which is cooled on a rear face by air flow through the housing, which decreases the temperature of the combustion products before exiting an outlet.

Abstract: A combustion system for a portable forced air heater having two frusta-conical sections attached to a circular burner tube, wherein each frusta-conical section has pre-determined vent hole patterns that allow the gas heater to have a variable burn rate.

Abstract: A portable heater adapted for use in a recreational enclosure or temporary work enclosure includes a housing having an air inlet on the lower front face. A gas supply is partially enclosed by the housing which provides propane to the mouth of a burner venturi located within the housing. Air is drawn through the air inlet and also enters the mouth of the burner venturi. The air and gas are mixed thoroughly as they travel upwardly through the burner venturi. A chimney effect increases fresh air flow velocity into the burner venturi and allows the heater to operate at a reduced fuel gas pressure. Upon exiting the burner venturi, the air/gas mixture is to a plenum and radiant surface where combustion takes place. Any conventional means may be provided to ignite the air/gas mixture in order to cause combustion. The combustion products deflect off a deflector, which is cooled on a rear face by air flow through the housing, which decreases the temperature of the combustion products before exiting an outlet.

Abstract: A heated make-up air system comprising a duct structure having a direct gas fired burner mounted therein. Adjacent the burner there is provided an opening for permitting air to flow there through. Mounted adjacent the opening one or more pivotally mounted panels or profile plates. The moveable panels or profile plates are spring-biased to assume a normally closed position. However, the moveable panels are moveable from the closed position to an open position in order to control air flow through the duct structure and past the burner.

Abstract: A mobile heater that can be easily moved to any location and can be stored and transported in a compact configuration is disclosed. The mobile heater comprises of a housing with a removable combustion chamber that can be removed and reattached as desired and one or more wheels that are movably attached to the housing, means for containing a combustible fuel within said housing, means for controlling and delivering the combustible fuel from said means for containing a combustible fuel to a nozzle attached to said housing, means for igniting said combustible fuel exiting from the nozzle, and means affixed within said housing for generating air movement moving air from behind the nozzle to the front of the nozzle and exit through the removable combustion chamber wherein after said mobile heater may be used to provide heat at desired locations by simply pushing the mobile heater so that it rolls on its attached wheels.