Abstract: A burner includes: a body defining an interior cavity; a burning surface located in the body and defining, at least in part, the interior cavity; a defusing surface located on an exterior portion of the body; ports on the body extending through the defusing and burning surfaces and configured to provide fluid communication between the interior cavity and ambient air outside the body; and an opening larger than at least one of the ports, the opening providing fluid communication between the interior cavity and a space outside of the body. A method of burning a gas and reducing acoustic feedback in a combustion device are also described.

Abstract: A burner suppliable with a mixture of air and fuel, comprising a burner body provided with a diffuser in which openings are made for the passage and subsequent combustion of said mixture, said diffuser is divided into a plurality of diffuser elements that are adjacent to one another, each diffuser element being at least partially free to dilate in at least one direction.

Abstract: An apparatus for reducing nitrogen dioxide emissions in a flueless heating appliance or heater includes a heat-exchanger for exchanging heat contained in fumes produced by the combustion of a fuel in the heating appliance. A heating appliance or heater without a fume flue includes a burner supplied with a gaseous fuel, an evacuator for discharging into an environment outside the heater fumes produced by combustion of the fuel, and a heat-exchanger for receiving the fumes from the burner and sending them to the evacuator. A method for reducing nitrogen dioxide emissions in a flueless heating appliance, supplied with a gaseous fuel, includes removing heat in a controlled manner from fumes produced by the combustion of the fuel so as to minimize the conversion of NO into NO2 in the fumes.

Abstract: An apparatus for reducing nitrogen dioxide emissions in a flueless heating appliance comprises heat-exchanger means suitable for being crossed by the fumes produced by the combustion of a fuel in said heating appliance. A heating appliance without a fume flue comprises burner means supplied with a gaseous fuel, evacuation means for discharging into the outside environment fumes produced by the combustion of said fuel and heat-exchanger means suitable for receiving said fumes from said burner means and sending them to said evacuation means. A method for reducing nitrogen dioxide emissions in a flueless heating appliance, supplied with a gaseous fuel, comprises removing heat in a controlled manner from fumes produced by the combustion of said fuel so as to minimize the conversion of NO into NO2 in said fumes.

Abstract: A system for feeding a plurality of burners (2a, 2b, 2c, 2d, 2n) includes a manifold (1) into which a flow of gaseous fuel is introduced via an inlet duct (5), said manifold (1) including an hollow body (3) provided with a plurality of outlets (6) each of which can be connected to a respective burner (2a, 2b, 2c, 2d, 2n), said manifold (1) further comprises distributing means (4) for selectively distributing said fuel to said burners (2a, 2b, 2c, 2d, 2n), said distributing means (7) being provided with connecting means (8) with one or more of said outlets (6).

Abstract: An atmospheric burner unit for use in an unvented gas log heater has a base and a gas distribution valve supported by the base. The valve has an inlet opening and a number of outlet openings. A plurality of burner elements are mounted by the base. Each of the burner elements has an inlet port and a plurality of outlet ports. The inlet port of each burner element is in proximate spaced relationship with an outlet opening of the gas distribution valve thereby defining open spaces through which gas may flow from the distribution valve to the burner elements thus obviating the use of tubes or other conduits.

Abstract: A method of combustion of a gaseous fuel in a heating appliance (1; 22) provided with at least one burner (15; 29; 34, 35, 36; 38), comprising mixing said gaseous fuel with a preestablished quantity of air to obtain an air-fuel mixture, supplying said mixture to the body of said at least one burner (15; 29; 34, 35, 36; 38), which is provided with a diffuser (19) on which openings (18) are made through which said mixture passes, causing the combustion of said mixture in order to generate flames (20; 32; 33; 34; 37; 42), the method further comprises irradiating heat towards said flames (20; 32; 33; 34; 37; 42) and a region directly surrounding said flames (20; 32; 33; 34; 37; 42).

Abstract: A method of combustion of a gaseous fuel in a heating appliance (1; 22) provided with at least one burner (15; 29; 34, 35, 36; 38), comprising mixing said gaseous fuel with a preestablished quantity of air to obtain an air-fuel mixture, supplying said mixture to the body of said at least one burner (15; 29; 34, 35, 36; 38), which is provided with a diffuser (19) on which openings (18) are made through which said mixture passes, causing the combustion of said mixture in order to generate flames (20; 32; 33; 34; 37; 42), the method further comprises irradiating heat towards said flames (20; 32; 33; 34; 37; 42) and a region directly surrounding said flames (20; 32; 33; 34; 37; 42).

Abstract: An artificial gas log set which simulates in a very realistic fashion a log fire in a fireplace. The artificial log set comprises a log, a burner tube having ports for creating a yellow flame that is in close proximity to the log and a second set of ports for creating a blue flame which is positioned between the yellow flame and the log. The blue flame impinges on the log and acts as a separator or curtain that prevents impingement by the yellow flame on the log. This prevents the creation of unwanted and dangerous levels of emissions such as oxides of carbon and nitrogen. An alternative embodiment replaces the blue flame and its ports with duct work and exhaust gases. The exhaust gases act as a separator between the log and the yellow flame. The result is a realistic looking, simulated wood burning fireplace which may be safely used in an unvented environment.