An exhaust tube holding member is supported by an exhaust pipe and holds, on an inner peripheral surface thereof, an exhaust tube to be inserted into the exhaust pipe. The exhaust tube holding member includes a first annular portion, a second annular portion, and an outward protruding portion. The first annular portion is formed with a first through hole. The second annular portion is formed with a second through hole in communication with the first through hole and having an inner diameter larger than that of the first through hole, and is connected to the first annular portion. The outward protruding portion protrudes peripherally outward from an outer peripheral surface of the second annular portion and is supported by the exhaust pipe. The inward protruding portion protrudes peripherally inward from an inner peripheral surface of the second annular portion and is supported by the exhaust pipe.

A method of relining a chimney includes: coating the inside surface of a chimney flue with a first layer of a flowable refractory material to provide a wet and sticky surface on the inside of the chimney flue; providing an insulating sleeve on the refractory surface so that the insulating sleeve adheres to the refractory surface; coating the inner surface of the sleeve with a second layer of flowable refractory material effective for hardening to provide a refractory surface on the inner surface of the sleeve; and allowing both layers of flowable refractory material to harden, thus providing a hardened relining comprising a first refractory layer, an insulating layer, and a second refractory layer on the inner surface of the sleeve.

A water heater heats water with a combustion gas. An exhaust tube includes one end portion and the other end portion, is connected to the water heater at one end portion, and inside thereof is defined as an emission path for the combustion gas. An exhaust pipe is greater in outer diameter than the exhaust tube, and a part of the exhaust tube on a side of the other end portion is introduced in the inside thereof. An exhaust terminal is attached to an end portion of the exhaust pipe and has an exhaust port for exhausting the combustion gas to the outside. An exhaust straightening member is attached to the other end portion of the exhaust tube and has an opening portion for allowing the combustion gas to flow out toward the exhaust port.

An exhaust tube includes one end portion and the other end portion and is connected at one end portion to a combustion apparatus, of which inside is defined as an exhaust passage for combustion gas. An exhaust pipe has an outer diameter greater than that of exhaust tube, into which a part of exhaust tube on a side of the other end portion is introduced. An exhaust adapter is attached between an outer circumferential surface of exhaust tube and an inner circumferential surface of exhaust pipe. On the side close to the other end portion in exhaust tube relative to exhaust adapter, an exhaust passage hole 1a is provided separately from an opening in the other end portion of exhaust tube. Exhaust passage hole has an opening area greater than a cross-sectional area of the exhaust passage and is in communication with the exhaust passage.

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 exemplary insulator for a flue of a residential oven includes a bendable insulating body having a first end, a second end, and a bending portion. A first cut is disposed between the bending portion and the first end and a second cut is disposed between the bending portion and the second end. The first cut is expandable to form a first opening and the second cut is expandable to form a second opening.