Fine filters are fitted with filter candles made from Pantel (special fire clay). As the gas flows through the filter candles from the outside to the inside, foreign matter is separated out on the outer wall. The filter material used is chemically resistant/neutral, has a high filtration performance coupled with a low-pressure loss, and is easy to clean with pressure washers.

Any condensate build-up can be drained via an optional siphon or condensate separator. If required, the fine filters can also be fitted with differential pressure gauging (U-tube or individual pressure gauges).