A method is provided for controlling airflow into a furnace that employs a velocity type damper. In one embodiment, the method for controlling airflow may include engaging a velocity type damper to an air port opening of a furnace. The velocity type damper includes at least one air controlling surface that is positioned proximate to a wall of the furnace at the air port opening so that air velocity exiting the at least one air controlling surface is substantially equal to the air velocity entering the air port opening to the furnace. The method may further include adjusting a cross sectional area through the velocity type damper to control air velocity into the furnace through the air port opening.

A damper for a furnace, the damper including an air port damper body engaged to an air port opening of a furnace; and at least one velocity plate in hinged engagement to the air port damper body so that an air controlling end surface of the at least one velocity plate is substantially aligned to a wall of the furnace at the air port opening when the at least one velocity plate is in a fully opened position.

A modular forced air burner assembly for rapidly heating contents of an oversized pot includes a frame, which has a top that is substantially open and configured to support a pot. A burner assembly that is selectively positionable below the pot is configured to burn a fuel gas to heat the pot and its contents. A forced air module that is selectively operationally couplable to the burner assembly is configured to force air into the burner assembly to enhance combustion of the fuel gas. A pipe is selectively couplable to an exterior of the frame so that the pipe extends from proximate to a midpoint of the frame past the top of the frame. The pipe is configured to direct heat across a sidewall of the pot to enhance heating of the pot and its contents.

The combustor includes a nozzle casing, and combustion nozzles disposed at position spaced apart from each other in the nozzle casing and configured to mix fuel with compressed air and eject the mixture, Where each of the combustion nozzles includes, a nozzle shroud including an inlet through which the compressed air is drawn into the nozzle shroud, and an outlet through which the compressed air is discharged out of the nozzle shroud, an injection cylinder disposed in the nozzle shroud and configured to allow the fuel to be injected into the injection cylinder, and swirlers disposed on an outer circumferential surface of the injection cylinder, where the nozzle shroud includes a region having a constant diameter from the inlet to a predetermined distance along a longitudinal direction of the nozzle shroud.

The combustor includes a nozzle casing, and combustion nozzles disposed at position spaced apart from each other in the nozzle casing and configured to mix fuel with compressed air and eject the mixture, Where each of the combustion nozzles includes, a nozzle shroud including an inlet through which the compressed air is drawn into the nozzle shroud, and an outlet through which the compressed air is discharged out of the nozzle shroud, an injection cylinder disposed in the nozzle shroud and configured to allow the fuel to be injected into the injection cylinder, and swirlers disposed on an outer circumferential surface of the injection cylinder, where the nozzle shroud includes a region having a constant diameter from the inlet to a predetermined distance along a longitudinal direction of the nozzle shroud.

The invention relates to an arrangement (1) including two burners (10), which has a common exhaust gas guiding device (2) and a common supply device (3) for combustion air. A backflow barrier (4) blocks a flow of a gaseous medium in a flow direction and is arranged in the exhaust gas guiding device (2) or in the supply device (3). The backflow barrier (4) has an opening (40) and a movable element (41) which is movable between two positions. The opening (40) is open in case the movable element (41) is in one of the two positions and closed in case the movable element (41) is in another of the two positions.

The invention relates to an arrangement (1) including two burners (10), which has a common exhaust gas guiding device (2) and a common supply device (3) for combustion air. A backflow barrier (4) blocks a flow of a gaseous medium in a flow direction and is arranged in the exhaust gas guiding device (2) or in the supply device (3). The backflow barrier (4) has an opening (40) and a movable element (41) which is movable between two positions. The opening (40) is open in case the movable element (41) is in one of the two positions and closed in case the movable element (41) is in another of the two positions.

A gas burner unit for a cooktop includes a spreader having a first side with a plurality of gas outlets and a second side opposite the first side and defining a portion of a fluid path. The spreader further defines a venturi in fluid communication with the gas outlets and extending away from the second side. The gas burner unit further includes an orifice holder having a protrusion defining an upwardly directed primary air inlet therethrough. The upwardly directed primary air inlet is in fluid communication with the fluid path associated with the spreader on a first end thereof and with the venturi on a second end thereof opposite the first end.

A gas burner unit for a cooktop includes a spreader having a first side with a plurality of gas outlets and a second side opposite the first side and defining a portion of a fluid path. The spreader further defines a venturi in fluid communication with the gas outlets and extending away from the second side. The gas burner unit further includes an orifice holder having a protrusion defining an upwardly directed primary air inlet therethrough. The upwardly directed primary air inlet is in fluid communication with the fluid path associated with the spreader on a first end thereof and with the venturi on a second end thereof opposite the first end.

A modular forced air burner assembly for rapidly heating contents of an oversized pot includes a frame, which has a top that is substantially open and configured to support a pot. A burner assembly that is selectively positionable below the pot is configured to burn a fuel gas to heat the pot and its contents. A forced air module that is selectively operationally couplable to the burner assembly is configured to force air into the burner assembly to enhance combustion of the fuel gas. A pipe is selectively couplable to an exterior of the frame so that the pipe extends from proximate to a midpoint of the frame past the top of the frame. The pipe is configured to direct heat across a sidewall of the pot to enhance heating of the pot and its contents.