Exhaust structure for combustion apparatus and construction method thereof

An exhaust structure for a combustion apparatus, comprising:

• an exhaust tube including one end portion and the other end portion and connected at said one end portion to said combustion apparatus, of which inside is defined as an exhaust passage for combustion gas;
• an exhaust pipe having an outer diameter greater than that of said exhaust tube, into which a part of said exhaust tube on a side of said other end portion is introduced;
• and
• an exhaust adapter attached between an outer circumferential surface of said exhaust tube and an inner circumferential surface of said exhaust pipe,
• an exhaust passage hole being provided on a side closer to said other end portion in said exhaust tube relative to said exhaust adapter, the exhaust passage hole being provided separately from an opening in said other end portion of said exhaust tube, and having an opening area greater than a cross-sectional area of said exhaust passage, and being in communication with said exhaust passage, the exhaust structure further comprising
• a member attached to said other end portion of said exhaust tube, wherein
• said exhaust passage hole is provided in said member.

A method of constructing an exhaust structure for a combustion apparatus, by which an exhaust tube is inserted into an exhaust pipe extending from inside to outside of a building, an exhaust terminal being provided at a tip end portion of said exhaust pipe on the outside, said method comprising the steps of:

• providing an exhaust passage hole in said exhaust tube having one end portion and the other end portion so as to be located on a side of said other end portion separately from an opening in said other end portion of said exhaust tube, said exhaust passage hole having an opening area greater than a cross-sectional area of an exhaust passage and being in communication with an inner passage of said exhaust tube;
• inserting said exhaust tube into said exhaust pipe until a part of said exhaust tube on the side of said other end portion provided with said exhaust passage hole comes into contact with a ceiling wall of said exhaust terminal;
• and
• connecting said one end portion of said exhaust tube to said combustion apparatus.