| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of installing a combustion device without performing a replacement of a component element when a combustion device is installed by a double-pipe system using a double pipe where an exhaust pipe is stored in an air supply pipe and also when a combustion device is installed by two-pipe system using a separate exhaust pipe and air supply pipe.SOLUTION: A combustion device comprises a supply/exhaust port formed to cause an air supply passage to enclose an outside of an exhaust passage and an air supply port where an air supply passage is formed. The supply/exhaust port is constituted in such a way that the port can be fitted to any of a double pipe used in the double-pipe system and a ring cap. The air supply port is constituted in such a way that it can be fitted to any of an air supply pipe used in the two-pipe system and a cap. The ring cap is formed into such a shape that the exhaust passage is released at the supply/exhaust port and the air supply passage is closed and an exhaust pipe used in the two-pipe system can be fitted. The cap is formed into such a shape as one in which the air supply passage is closed at the air supply port. |
