In an indoor installation type combustion apparatus in which an upper surface of the exterior case has formed therein: a cylindrical exhaust connection port which is in communication with an exhaust duct and which is connectable to an exhaust pipe; a first cylindrical air supply connection port which is connectable to an air supply pipe of double-pipe system containing therein the exhaust pipe and which encloses the exhaust connection port; and a second cylindrical air supply connection port which is connectable to an air supply pipe of twin-pipe system which is separate from, and independent of, the exhaust pipe, a low-cost apparatus is provided in which the air flowing in from whichever the first and the second air supply connection ports will be treated by one and the same supply-air filter. An air supply box which is in communication with both the first and the second air supply connection ports is disposed. An outlet opening is formed at one place of the air supply box so that the air flowing in from an arbitrary air supply connection port between the first and the second air supply connection ports is discharged into an inner space of the exterior case. A supply-air filter to collect foreign matters in the air is mounted in the outlet opening.

In an indoor installation type combustion apparatus in which an upper surface of the exterior case has formed therein: a cylindrical exhaust connection port which is in communication with an exhaust duct and which is connectable to an exhaust pipe; a first cylindrical air supply connection port which is connectable to an air supply pipe of double-pipe system containing therein the exhaust pipe and which encloses the exhaust connection port; and a second cylindrical air supply connection port which is connectable to an air supply pipe of twin-pipe system which is separate from, and independent of, the exhaust pipe, a low-cost apparatus is provided in which the air flowing in from whichever the first and the second air supply connection ports will be treated by one and the same supply-air filter. An air supply box which is in communication with both the first and the second air supply connection ports is disposed. An outlet opening is formed at one place of the air supply box so that the air flowing in from an arbitrary air supply connection port between the first and the second air supply connection ports is discharged into an inner space of the exterior case. A supply-air filter to collect foreign matters in the air is mounted in the outlet opening.

The present double walled grease duct includes a tubular outer shell surrounding a tubular inner liner, wherein a spacer is positioned perpendicular to the walls of the outer shell and the inner liner. The spacer can include a plurality of vertical metal strips extend from a top edge of the spacer to the bottom edge of the spacer, wherein the top edge of the spacer contacts the walls of the outer shell and wherein the bottom edge of the spacer contacts the walls of the inner liner. The metal strips resist the different rates of thermal expansion between the outer shell and inner liner ultimately preventing the collapse of the inner liner under pressure from thermal expansion.

The present double walled grease duct includes a tubular outer shell surrounding a tubular inner liner, wherein a spacer is positioned perpendicular to the walls of the outer shell and the inner liner. The spacer can include a plurality of vertical metal strips extend from a top edge of the spacer to the bottom edge of the spacer, wherein the top edge of the spacer contacts the walls of the outer shell and wherein the bottom edge of the spacer contacts the walls of the inner liner. The metal strips resist the different rates of thermal expansion between the outer shell and inner liner ultimately preventing the collapse of the inner liner under pressure from thermal expansion.

There is provided a wind boosted ventilation apparatus for removing exhaust gases from inside enclosed spaces to the atmosphere, said ventilation apparatus comprising a ventilation duct and an external wall having a plurality of openings, a circular pressure plate placed on the top of said ventilation duct, a shroud surrounding said ventilation duct in a such way that a gap is defined between said ventilation duct and said shroud, and a plurality of guide vanes extending outwardly and transversally with respect to the central axis, wherein said openings are extending along said external wall of the ventilation duct and are inclined at a predetermined angle with respect to central axis of said ventilation duct, and said plurality of guide vanes are placed in a such way that they divide the area between the ventilation duct and the shroud into a plurality of compartments.

There is provided a wind boosted ventilation apparatus for removing exhaust gases from inside enclosed spaces to the atmosphere, said ventilation apparatus comprising a ventilation duct and an external wall having a plurality of openings, a circular pressure plate placed on the top of said ventilation duct, a shroud surrounding said ventilation duct in a such way that a gap is defined between said ventilation duct and said shroud, and a plurality of guide vanes extending outwardly and transversally with respect to the central axis, wherein said openings are extending along said external wall of the ventilation duct and are inclined at a predetermined angle with respect to central axis of said ventilation duct, and said plurality of guide vanes are placed in a such way that they divide the area between the ventilation duct and the shroud into a plurality of compartments.

Compact smoke or air diluter for high-temperature flue gas and contaminated air for being mounted at the top of or integrated in a chimney stack or a ventilation system that dilutes and dissipates high-temperature flue gas or contaminated air in the atmosphere, and ensures a normative draw/sub-atmospheric pressure defined on the basis of preceding requirements to or from connected functional applications consisting of cooling unit/ventilator part: Cooling pipe 9 mounted inserted in cooling top 12. Motor 1 mounted in interior cooling cup 4. The motor shaft is caused to continue out through a circular opening at the bottom of interior cooling cup 4 in a dimension that allows cooling air to pass below the motor 1, past the motor shaft, and out through the opening to exterior cooling cup 5. Between the bottom of interior cooling cup 4 and exterior cooling cup 5, there is, on the motor shaft, securely mounted a cooling medium 8. Through a hole at the bottom of exterior cooling cup 5, the motor shaft is caused to continue, where, at the end, there is mounted a ventilator medium holder 11, on which the ventilator medium 3 is mounted.

A venting system includes a venting installation cap assembly for a venting system having at least an outer wall and an inner exhaust tube. The assembly includes an exhaust cap having an exhaust path coupled to the inner exhaust tube defined by a pipe section. A planar support ring having an annulus through which the pipe section passes rests on the outer tube or an adapter to the outer tube. The ring annulus surrounds the pipe section and has a diameter greater than a diameter of the outer wall. The planar support ring includes a plurality of airflow regions, surrounds the exhaust path and providing an airflow path between an exterior and a region between the outer wall and the inner exhaust tube.

A venting system includes a venting installation cap assembly for a venting system having at least an outer wall and an inner exhaust tube. The assembly includes an exhaust cap having an exhaust path coupled to the inner exhaust tube defined by a pipe section. A planar support ring having an annulus through which the pipe section passes rests on the outer tube or an adapter to the outer tube. The ring annulus surrounds the pipe section and has a diameter greater than a diameter of the outer wall. The planar support ring includes a plurality of airflow regions, surrounds the exhaust path and providing an airflow path between an exterior and a region between the outer wall and the inner exhaust tube.

The present double walled grease duct includes a tubular outer shell surrounding a tubular inner liner, wherein a spacer is positioned perpendicular to the walls of the outer shell and the inner liner. The spacer can include a plurality of vertical metal strips extend from a top edge of the spacer to the bottom edge of the spacer, wherein the top edge of the spacer contacts the walls of the outer shell and wherein the bottom edge of the spacer contacts the walls of the inner liner. The metal strips resist the different rates of thermal expansion between the outer shell and inner liner ultimately preventing the collapse of the inner liner under pressure from thermal expansion.