| 摘要 |
PROBLEM TO BE SOLVED: To provide an air supply and exhaust pipe which prevents birds etc. from intruding into the interior and prevents clogging of an air supply port etc., which enables easier processing and is inexpensively provided, and to provide a heat source machine which includes the air supply and exhaust pipe and thereby is inexpensively provided.SOLUTION: Error inflow preventive means 29 for preventing exhaust air exhausted from an exhaust path from flowing into an air supply path is provided at an air supply and exhaust pipe 2 in which an outer cylinder 12 fits onto an inner cylinder 13 to form a double pipe structure and the inner cylinder 13 and the outer cylinder 12 respectively form the exhaust path for flowing the exhaust air from the base end side to the tip side and the air supply path for flowing air from the tip side to the base end side. Further, protruding parts 31, which are integrally formed with the inner cylinder 13 so that the inner cylinder 13 protrudes to the outer side, are provided at a space 40 formed between an inner peripheral surface of the outer cylinder 12 and an outer peripheral surface of the inner cylinder 13. |
