| 摘要 |
The filter devices allow easy cleaning of various joint portions such as those located near changeover valves of the filter devices. Heating units which accommodate filter cases may be formed with openings which allow such joint portions between the filter cases and the heating units to be accessed and cleaned. Alternatively, the heating units may include two relatively movable parts which, when opened, allow the joint portions to be accessed once the filter cases are removed. The heating units themselves may be detachable from a support frame so as to expose other joint portions.
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