| 摘要 |
PROBLEM TO BE SOLVED: To prevent drain piping of an induction air fan from being corroded. SOLUTION: Between a drain piping 4 of a waste gas inlet side duct 2 of an induction air fan 1 and a drain piping 5 of a waste gas outlet side duct 3 there is provided a communication tube 6 for communicating both of the drain pipings 4 and 5. When drain is not discharged from both drain pipings 4, 5, waste gas is circulated between both drain pipings 4, 5 to prevent temperature in both pipings 4, 5 from becoming a dew point or lower.
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