| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure for exhaust duct that can be reduced in temperature management cost by improving the heat insulating effect of an exhaust duct. SOLUTION: An opening 12c is formed in the end section of an exhaust pipe 12 on a main duct 13 side and another opening 31c is formed in the end section of a coated pipe 31 surrounding the exhaust pipe 12 on a discharge source (drying furnace) 11 side. The outdoor air introduced from the opening 31c of the coated pipe 31 is discharged into an exhaust route from the opening 12c of the exhaust pipe 12 after passing through the clearance between the exhaust pipe 12 and coated pipe 31.
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