Polluted air (1) gets into the expansion chamber (2), where heavier fractions fall directly to the container and the filtration takes place in the filter chamber (3), the dust which remains on the refill falls down into a container under the impulse of compressed air, then the filtered air (4) gets into the fan (5), where after going through the muffler it gets outside (6).
We can be sure that the insertable filter is damaged when there is mechanical damage, when the filter is perforated, torn etc. and pollution comes out through the filtering fan, while clean air should be discharged.
When the insertable filter is not damaged, it is difficult to determine visually the level of filter usage because the filter is usually covered with a layer of dust - which is a natural process. Some filters have special indicators informing the user about the necessity of replacing the insertable filter (e.g. CleanAir BASIC). If the device does not have such an indicator, its efficiency can be measured with a special device (anemometer), which allows us to determine the efficiency, following that we compare it with the efficiency indicated by the producer.
Anti-spall agent (silspaw) is used for the protection of the blowpipe nozzle, tools and the surface of welded material against moltening of metal spatters while welding with electrical techniques. Anti-spall agent contains greasy substances, which get sticky during the welding process. When the welded material is heated, the anti-spall agent vapours and binds with the dust and smoke from welding.
The use of anti-spall agents shortens the lifecycle of insertable filters. CleanAir company suggest providing the installation with a A.S.P. deducting system.