One aspect of this disclosure provides a heat exchanger that comprises a first panel half coupled to a corresponding second panel half that form a passageway having at least a first chamber adjacent an inlet end of the passageway and a second chamber and overlapping interference patterns formed in each of the first and second panel halves that extend along at least a portion of the length of the passageway and located between at least the first and second chambers.

A method of custom manufacturing a flame arrestor includes providing a housing having an interior surface and an exterior surface where the exterior surface of the housing is shaped to fit within a fluid passageway. The method includes forming, using an additive manufacturing technique, a three-dimensional lattice structure by depositing a first material onto the interior surface of the housing in a predetermined pattern. The lattice structure includes a plurality of connected lattice members forming channels extending from a first end to a second end of the three-dimensional lattice structure. An element of a second material is provided adjacent to the three-dimensional lattice structure. The second material is different than the first material and the element is configured to draw heat away from fluid flowing through the plurality of channels.

A method of making a heat exchanger that includes sealing tubes to header slots and brazing the tubes to the header slots. The method further includes coupling a cover to the header to cover a liquid-side surface of the header and to cover ends of the tubes, and applying flux to an air-side surface of the header and to the tubes. Coupling the cover to the header is performed after sealing the tubes to the header slots and coupling the cover to the header is performed before applying flux to the air-side surface of the header and to the tubes. Applying flux is performed before brazing each of the tubes to the header slots and sealing each of the tubes to the header slot includes sealing a perimeter of each of the tubes to the header slot.

A method of making a heat exchanger that includes sealing tubes to header slots and brazing the tubes to the header slots. The method further includes coupling a cover to the header to cover a liquid-side surface of the header and to cover ends of the tubes, and applying flux to an air-side surface of the header and to the tubes. Coupling the cover to the header is performed after sealing the tubes to the header slots and coupling the cover to the header is performed before applying flux to the air-side surface of the header and to the tubes. Applying flux is performed before brazing each of the tubes to the header slots and sealing each of the tubes to the header slot includes sealing a perimeter of each of the tubes to the header slot.

A method of manufacturing a box header for an air-cooled heat exchanger. The method includes the steps of boring at least one hole into at least one end of an elongated slab of metal. Material from the slab is milled out adjacent to the at least one hole to form an elongated internal chamber in the slab having at least one open end. An inlet nozzle opening is machined into the elongated chamber and an outlet nozzle opening is machined into the elongated chamber. A plurality of tube holes and a plurality of plug holes are drilled and tapped in the elongated slab into the internal chamber. An end block is welded to the at least one open end in order to form a closed internal chamber.

A machining method for a burred flat hole includes first an overhang portion is formed in a flat hole-forming region in a metal plate in a first step, subsequently a flat hole portion is formed in the overhang portion in a second step, and finally burring is formed on the peripheral edge portion of the hole portion in a third step. Accordingly, when burring is to be formed, overhanging machining and perforating machining have been substantially completed, and therefore pressing force of a punch for burring machining can be set to the minimum value necessary for burring formation.

One aspect of the disclosure provides a termination for use with a furnace. The termination, in one embodiment, includes a face plate including an exhaust region and an air supply region, the face plate having a front surface and an opposing back surface. The termination, in this embodiment, further includes an exhaust termination portion extending from the back surface in the exhaust region, the exhaust termination portion capable of engaging a terminal end of a variety of different size exhaust conduits associated with a furnace. The termination, in this embodiment, further includes an opening extending through the face plate in the exhaust region, the opening aligned with the exhaust termination portion.

One aspect of this disclosure provides a heat exchanger that comprises a first panel half coupled to a corresponding second panel half that form a passageway having at least a first chamber adjacent an inlet end of the passageway and a second chamber and overlapping interference patterns formed in each of the first and second panel halves that extend along at least a portion of the length of the passageway and located between at least the first and second chambers.

A high efficiency compact boiler is disclosed which includes a burner configured to introduce combustion gases into an interior region of the boiler, a heat exchange tube made of a length of finned tubing in the form of a helical coil positioned within the interior region of the boiler such that combustion gases from the burner can flow from a region inside the helical coil to a region outside the helical coil, and a floating baffle configured to redirect the flow of combustion gases around the finned tubing as it passes from the region inside the helical coil to the region outside the helical coil, the baffle being positioned proximal adjacent turns of the helical coil and having a coiled configuration corresponding substantially to the helical coil.

A machining method for a burred flat hole includes first an overhang portion is formed in a flat hole-forming region in a metal plate in a first step, subsequently a fiat hole portion is formed in the overhang portion in a second step, and finally burring is formed on the peripheral edge portion of the hole portion in a third step. Accordingly, when burring is to be formed, overhanging machining and perforating machining have been substantially completed, and therefore pressing force of a punch for burring machining can be set to the minimum value necessary for burring formation.