A flexible hose liner is provided having a cylindrical body extending along a longitudinal axis from a first end to a second end. First and second sleeves form the cylindrical body by separate continuous ribbons having a plurality of convolutions formed in a helical pattern along the cylindrical body from the first end to the second end. A ring is formed in each revolution about the longitudinal axis of the continuous ribbon of the first and second sleeves. A plurality of rings form the cylindrical body, each ring has a first convolution and an ending convolution such that a mechanical connection is formed between the ending convolution of a preceding ring and the first convolution of a succeeding ring. The mechanical connection of the between the rings of the first sleeve being different from the mechanical connection of the rings of the second sleeve.

A flexible hose liner is provided having a cylindrical body extending along a longitudinal axis from as first end to a second end. First and second sleeves form the cylindrical body by separate continuous ribbons having a plurality of convolutions formed in a helical pattern along the cylindrical body from the first end to the second end. A ring is formed in each revolution about the longitudinal axis of the continuous ribbon of the first and second sleeves. A plurality of rings form the cylindrical body, each ring has a first convolution and an ending convolution such that a mechanical connection is formed between the ending convolution of a preceding ring and the first convolution of a succeeding ring. The mechanical connection of the between the rings of the first sleeve being different from the mechanical connection of the rings of the second sleeve.

The invention provides a device for removing heat from a building, the device having: a first tubular member defining a first cavity; a second tubular member defining a second cavity, whereby said second tubular member resides within the first cavity and is coaxial to the first tubular member; and a double conic body coaxially residing in the first cavity and coaxially positioned with the second tubular member.

Also provided is a method for removing heat from a building, the method having the steps of: directing heat-containing exhaust emanating from a flue, defining a first diameter, to a passageway received by the flue, whereby the passageway defines a longitudinal axis and a periphery circumscribing the axis; forming the directed exhaust into a slipstream, wherein the slipstream generally travels along the longitudinal axis; and routing precipitation entering the passageway to the periphery.

An exhaust tube holding member for holding an exhaust tube inside an exhaust pipe includes a main body. The exhaust tube is connected to a combustion apparatus and introduced into the exhaust pipe. The main body includes a first surface and a second surface opposing each other, and a rim surrounding the periphery of the first surface and the second surface. The main body is provided with an exhaust tube holding hole and an exhaust tube inserting notch. The exhaust tube holding hole is configured to penetrate the main body from the first surface to the second surface. The exhaust tube inserting notch is configured to penetrate the main body from the first surface to the second surface and extend from the exhaust tube holding hole to the rim.

An exhaust structure for combustion apparatus includes an exhaust tube connected to a water heater, an exhaust pipe through which the exhaust tube is introduced, and an exhaust tube fixing member for fixing a position of the exhaust tube relative to the exhaust pipe. The exhaust tube fixing member includes a first fixing portion having a cylindrical shape and fixed to the exhaust tube, and an attaching portion connected to the first fixing portion and attached to the exhaust pipe. The attaching portion have a first cylindrical portion having a first inner diameter D2, and a second cylindrical portion having a second inner diameter D3 smaller than the first inner diameter D2 of the first cylindrical portion.

A joint seal system and method may include a seal and a band. The seal may be positioned between abutting flanges of two adjacent duct sections. A band may be positioned over the two flanges and the flange interface. The joint seal system and method may be configured to mitigate and/or eliminate leakage of pressure, flue gases, condensate, and/or any other fluid, gas, and/or vapor between abutting flanges of duct sections at a flange interface.

A vent attachment for a tankless water heater is provided. The vent attachment includes a first conduit and a second conduit. The first conduit includes a first exhaust pathway and a first air intake pathway. The first air intake pathway includes an adjustable portion having a first adjustable length and a first adjustment mechanism. The second conduit includes a second exhaust pathway and a second air intake pathway. The second air intake pathway slidably engages with the first air intake pathway. The second air intake pathway includes a projecting portion having a second adjustable length equal to or greater than the first adjustable length and a second adjustment mechanism. The first adjustment mechanism and the second adjustment mechanism slidably couple the second conduit with the first conduit for a desired length of the vent attachment.

A joint seal system and method may include a seal and a band. The seal may be positioned between abutting flanges of two adjacent duct sections. A band may be positioned over the two flanges and the flange interface. The joint seal system and method may be configured to mitigate and/or eliminate leakage of pressure, flue gases, condensate, and/or any other fluid, gas, and/or vapor between abutting flanges of duct sections at a flange interface.

A joint seal system and method may be configured to mitigate and/or eliminate leakage of pressure, flue gases, condensate, helium vent gas and/or any other fluid, gas, and/or vapor between abutting flanges of duct sections at a flange interface. A weld-free MRI machine quench vent discharge system using pre-fabricated chimney duct components may be configured by selecting a quench vent outlet and discharge location, mapping a route, and determining directional changes. Elbows and bellows sections are selected based on these changes, and the distance between the MRI machine and discharge location is calculated to determine support positions. The system is assembled using prefabricated chimney ducts, each comprising an inner shell with spinner bolt flanges and a leak-free joint with a PTFE gasket. The design includes an outer shell with an insulation gap for thermal protection.

A representative system includes: an inner stack defining a flow path to direct exhaust gasses from the exhaust air outlet of a heating appliance to an exhaust; an outer stack disposed about an exterior of the inner stack and being spaced therefrom to form a combustion air passage in a heat transfer relationship with the exterior of the inner stack; a combustion air opening disposed at the intake end of the outer stack configured to receive combustion air and provide the combustion air to the combustion air passage; an air dam positioned to terminate the combustion air passage; a combustion air conduit configured to direct the combustion air from the combustion air passage to the combustion air inlet of the heating appliance; wherein, in operation, heat is transferred from the exhaust gasses to the combustion air directed through the combustion air passage.