Abstract: A flue tuning and emissions saving system is disclosed. The device or system includes an inlet duct (20) having an inlet cross-sectional area and an outlet duct (18) having an outlet cross-sectional area that is the same as the inlet cross-sectional area. An outer duct (16) that is of an outer duct cross-sectional area is sealingly connected to the inlet duct (20) and the outlet duct (18), while separating the inlet duct (20) and the outlet duct (18). At least one disc (12) that is positioned at a specified distance S between the inlet duct (20) and at the same S to the outlet duct (18) and centered in the outer duct, the disk (12) includes a specified disc area so that flow of an exhaust gas entering the system through the inlet duct (20) will be diverted by the disc (12) into the outer duct (16) before the flow continues to the outlet duct (18) without encountering a restriction in flow cross-sectional area.

Abstract: A flue insert which includes a helical vane having an open center axial area and means for mounting the helical vane within a furnace flue stack. The helical vane rotates counterclockwise, i.e. it rotates in a counterclockwise direction from the furnace/boiler end to the atmospheric end of the flue. The helical vane rotates for approximately 540.degree., and has a width which is equal to approximately one-third of the diameter of the flue.

Abstract: A flue insert (50) for insertion into a flue stack (12). The flue insert includes a sleeve (52) that is inserting into the stack so as to function as part of the stack. A vane (54) is disposed in the sleeve. One end of the vane is fixedly attached to the sleeve. The opposed end of the vane is adjustably attached to the sleeve so that after the insert is installed, the overall length of the vane can be selectively set.

Abstract: A stove suitable for large-burner cooking generating a high heat exhaust has an enclosed stove casing with an upper cooking surface, a hollow interior, and a burner well recessed into the interior of the casing. A large burner is positioned in the burner well, and a cooking vessel can be placed over the well so as to close the burner flame off from the outside. The burner well preferably supports a wok or other rounded-bottom cooking vessel. The high heat exhaust from the burner is trapped in the well and entrained by natural convection into a duct member to a duct casing at a rear side of the stove. The duct casing has a double wall construction and baffles in its interior forming a labyrinthine channel for mixing cold air supplied through openings in the stove casing and the hot exhaust air from the large burner.

Abstract: A device for adjustably restricting the flow of exhaust gases in a furnace flue to conserve fuel is disclosed. It comprises two interlocking pipe sections and a helical element having one end fixed to the inner surface of each pipe section. The helical element has a circular opening along its central axis. The degree of restriction provided by the device is adjusted by twisting or separating the two pipe sections.

Abstract: A device for adjustably restricting the flow of exhaust gases in a furnace flue to conserve fuel is disclosed. It comprises two interlocking pipe sections and a helical element having one end fixed to the inner surface of each pipe section. The helical element has a circular opening along its central axis. The degree of restriction provided by the device is adjusted by twisting or separating the two pipe sections.

Abstract: A chimney by-pass is disclosed for use with a main chimney. In case of a chimney fire, a movable damper closes off the main chimney, substantially reducing the severity of the chimney fire. The movable damper also opens an auxiliary chimney, allowing smoke to exit, uninterrupted through the auxiliary chimney, and may include a fan to assist the exit of smoke into the atmosphere. The movable damper may be actuated manually or automatically in case of a chimney fire.

Abstract: Disclosed is a wet-based, wood-burning boiler that has a combustion chamber that heats water in a cylindrical main boiler chamber and in a communicating rear boiler chamber. A flue directly exhausts smoke, flue gases and products of combustion from the combustion chamber without creosote formation, while a damper plate, tracked to its closed position: indirectly exhausts without lowering the temperature of the exhausting flue gases to creosote deposition temperature because the damper plate structure has a more effective draft area than the flue draft area, while at the same time the damper plate structure retains the highest temperature possible in the combustion chamber, and traps and transfers heat to the water in the boiler chambers more quickly and with a faster recovery rate.The wet-based, wood-burning boiler can be converted to a wood-burning, forced, hot-air furnace while retaining its tracked damper plate structure and functional attributes associated therewith.

Abstract: A stove apparatus which is designed to achieve relatively complete combustion of solid fuel such as wood or coal. A combustion chamber is defined by a connected wall housing and includes a primary flue opening at an upper rear portion thereof. Primary combustion air enters into the forward portion of the combustion chamber and the resultant combustion gases are deflected from normally passing to the chimney via the primary exit flue by means of a downwardly extending baffle which creates an increased temperature exit zone adjacent thereto. A device for introducing secondary combustion directly into said exit zone is provided so as to insure more complete combustion and reduce the amount of tars, i.e., creosote, produced in the combustion process. In addition, an unique device for regulating the amount and the combustion chamber is provided.

Abstract: Moveable and fixed vertically depending, longitudinally spaced baffles are mounted perpendicular to the direction of gas flow on the roof of large generally horizontal runs of flues carrying dust laden gas as a cost-effective way to reduce gravitational dust dropout.

Abstract: A venting system for gas fired heating plants including a diverter box, conduit means for conducting gas from one heating plant upwardly in one leg of an inverted U pattern and downwardly into the second leg of such pattern while admitting air at the bottom of the box to form a heat lock to restrict the flow of air in this pattern, and a second conduit means for conducting gas from a second heating plant upwardly and then downwardly of the second leg of the pattern for the first heating plant to a level at which gas may be passed within the box from the inlet to the outlet of the box, thus providing a structure which avoids the blowing out of the pilot flame in one or another of the heating plants.