Description The fume extraction system is equipped with a safety device to monitor the minimum air volume flow to be extracted. A manometer is used for monitoring the point at which the minimum volume flow is reached is marked on the dial scale. If the manometer indicates a higher vacuum (>180 mbar), the filter must be cleaned. If the minimum volume flow is not reached, the manometer indicates a high value and an acoustic signal sounds. The filter must be then cleaned with compressed air. During the dedusting procedure by rotation, the exhaust fume deposits are removed from the filter elements and the filter is refreshed. The separated dust is collected in the dust collecting drawer. After longer operating times, the fine dust penetrates into the filter and the filter becomes clogged. Even a dedusting of the filter cannot remove this dust. The filter must be replaced by a new one.
