| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling system prevented from the degradation of cooling efficiency caused by the accumulation of foreign matters between two filters. SOLUTION: The cooling system comprises a foreign matter outlet 7 equipped with a hinged door 8 so that it can discharge foreign matters directly into the air through the foreign matter outlet 7 without passing the same through the other side filter 6 when air is fed forward. As a result, no foreign matter is accumulated between two filters 5 and 6 so that the system is maintenance- free and can maintain a cooling effect for a long period of time.
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