Abstract: A venting system includes a venting pipe comprising a chase through a structure. The chase includes a first end positioned adjacent an appliance installation, a second end exiting a structure and a third end adjacent another appliance. A vent tube comprising a sealed non-corrosive material is provided in the chase between the second end and the third end, itself coupled to a high efficiency appliance. The vent tube has a first end and a second end and is positioned between the second end of the venting pipe and the third end of the venting pipe. The vent tube is coupled to a first appliance and the venting pipe is coupled to a second appliance. A vent cap is coupled to the second end of the first vent tube and to the second end of the venting pipe.

Abstract: An interlocking mechanism includes an entry channel and a rotational channel positioned adjacent to entry channel. A locking bead is positioned in the rotational channel at a position in the channel defined to engage a mating element in a locking lug on a mating component when the lug is positioned adjacent to an end of the channel. The entry channel may include a face increasing in height from the entry portion to the end portion.

Abstract: A coupling feature for double-walled pipes. A double-walled vent pipe section has an outer wall with corresponding male and female coupling features formed on opposite ends thereof. The inner wall of the double-walled pipe section has a small ridge formed around the circumference of one end. When pipe sections are coupled together, the male and female coupling features on the outer walls engage, and the ridge on the inner wall of one pipe section engages with the bare inner wall of the other pipe section.

Abstract: A ceiling support box is an interface for coupling two sections of pipe as part of a venting apparatus for a heating appliance. Dual functionality is provided in a single integrated device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in combustion air for use by the heating appliance.

Abstract: An improved wall thimble as part of a venting apparatus for a heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in combustion air for use by the heating appliance. The wall thimble is preferably formed as a two-cylindrical part housing such that a first portion can be inserted into a second portion. When a smaller exhaust pipe is routed through the two-part housing, an annular region is formed between the exhaust pipe and the walls of the housing. A first air vent is formed in the first portion to draw combustion air into the annular region from outside. A second air vent is formed in the second portion to route the combustion air from the annular region out through the second air vent to be coupled with the combustion air inlet. A baffle is disposed in the first portion to preheat the combustion air.

Abstract: A vent cap for a direct vent system. The cap may include a base plate and a semicircular outer housing secured to the base plate. A divider is coupled within the outer housing, with the divider forming in exhaust region and an inlet region. A heat shield is positioned within the semicircular outer housing in the outlet region. A direct vent pipe coupling is provided in the base plate and includes a first pipe having an outlet coupled to the divider.

Abstract: A wall thimble for use with a heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in outside combustion air for use by the heating appliance. The wall thimble is formed as a two-part housing such that a first portion can be inserted into a second portion. When an exhaust pipe is routed through end plates on the housing portions, a closed region is formed between the exhaust pipe and the housing portions. A first air vent is formed in the first or outside portion to draw combustion air into the closed region from outside. A second air vent is formed in the second or inside portion to route the combustion air from the closed region to an opening in the housing where a combustion air inlet pipe is connected.

Abstract: A ceiling support box is an interface for coupling two sections of pipe as part of a venting apparatus for a heating appliance. Dual functionality is provided in a single integrated device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in combustion air for use by the heating appliance.

Abstract: An improved wall thimble is useful as part of a venting apparatus for a direct vent heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in outside combustion air for use by the heating appliance. The wall thimble is formed as a two-part housing such that a first cylindrical portion can be inserted into a second cylindrical portion. When a smaller diameter exhaust pipe is routed through the cylindrical portions, an annular region is formed between the exhaust pipe and the cylindrical portions. A first air vent is formed in the first cylindrical portion to draw combustion air into the annular region from outside. A second air vent is formed in the second cylindrical portion to route the combustion air from the annular region to an opening in the housing where a combustion air inlet pipe is connected.

Abstract: An improved wall thimble as part of a venting apparatus for a heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in combustion air for use by the heating appliance. The wall thimble is preferably formed as a two-cylindrical part housing such that a first portion can be inserted into a second portion. When a smaller exhaust pipe is routed through the two-part housing, an annular region is formed between the exhaust pipe and the walls of the housing. A first air vent is formed in the first portion to draw combustion air into the annular region from outside. A second air vent is formed in the second portion to route the combustion air from the annular region out through the second air vent to be coupled with the combustion air inlet. A baffle is disposed in the first portion to preheat the combustion air.

Abstract: A wall thimble for use with a heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in outside combustion air for use by the heating appliance. The wall thimble is formed as a two-part housing such that a first portion can be inserted into a second portion. When an exhaust pipe is routed through end plates on the housing portions, a closed region is formed between the exhaust pipe and the housing portions. A first air vent is formed in the first or outside portion to draw combustion air into the closed region from outside. A second air vent is formed in the second or inside portion to route the combustion air from the closed region to an opening in the housing where a combustion air inlet pipe is connected.

Abstract: An improved wall thimble is useful as part of a venting apparatus for a direct vent heating appliance. Dual functionality is provided in a single wall thimble device by having a vent path for exhausting combustion by-products, and a separate air inlet path to draw in outside combustion air for use by the heating appliance. The wall thimble is formed as a two-part housing such that a first cylindrical portion can be inserted into a second cylindrical portion. When a smaller diameter exhaust pipe is routed through the cylindrical portions, an annular region is formed between the exhaust pipe and the cylindrical portions. A first air vent is formed in the first cylindrical portion to draw combustion air into the annular region from outside. A second air vent is formed in the second cylindrical portion to route the combustion air from the annular region to an opening in the housing where a combustion air inlet pipe is connected.

Abstract: A coupling feature for double-walled pipes. A double-walled vent pipe section has an outer wall with corresponding male and female coupling features formed on opposite ends thereof. The inner wall of the double-walled pipe section has a small ridge formed around the circumference of one end. When pipe sections are coupled together, the male and female coupling features on the outer walls engage, and the ridge on the inner wall of one pipe section engages with the bare inner wall of the other pipe section.

Abstract: An interlocking mechanism suitable for use with exhaust components. The mechanism may be provided on pipes, components, adapters or appliances. The mechanism includes an entry channel and a rotational channel positioned adjacent to entry channel. A locking bead is positioned in the rotational channel at a position in the channel defined to engage a mating element in a locking lug on a mating component when the lug is positioned adjacent to an end of the channel. The entry channel may include a face increasing in height from the entry portion to the end portion.

Abstract: A chimney liner system for insertion into a masonry chimney from the top of the chimney down to a stove or fireplace insert. If an offset or a chimney shelf exists in the chimney, a flexible metal pipe member is connected to the bottom end of the chimney liner system. A ceramic heat resistant cloth formed as a sleeve encloses the flexible metal pipe member in selected systems, and in some systems, the sleeve encloses the entire chimney liner system. In some applications, the sleeve may be made from a fiberglass cloth sewn or connected to an inner blanket insulation.

Abstract: A triple wall factory built thermally balanced on demand air flow metal chimney system in which the chimney sections are formed with an insulation chamber filled with insulation material which surrounds the chimney flue and an air passage chamber surrounding the insulation chamber. A negligible amount of cooling air flows upwardly through the air passage chamber during normal operation of the chimney. The air flow is separated from the inner flue by the insulating blanket. This allows the flue to maintain the proper elevated temperatures to resist creosote deposits. During periods of sustained high temperature operation or creosote fire episodes, substantial on demand cooling air flows upwardly through the air passage chamber drawing off heat from the inner flue and the outer wall.

Abstract: An improved flue pipe for placement in the flue associated with an interior fireplace having a stove mounted therein. The flue pipe extends through the flue and has a spark arrestor mounted on its upper end. The lower end of the flue pipe has means for connecting it to the combustion gas outlet of the stove mounted in the fireplace. The flue pipe has a number of interconnected sections and several of the sections are of shapes permitting the flue pipe to extend through the damper region of the flue notwithstanding the reduced cross-sectional area of the damper region.