The GL series devices can, according to the respective application, be equipped with different filter modules to provide for the best possible adaptation to a wide variety of applications. This leads to an optimization of filter costs and maintenance efforts. Additionally, it is possible to change the device's filter equipment later in case of an application change. Different pre-filters and the so-called particle filter H13 (filtration efficiency of 99.95% at 0.1-0.3µm) provide for the filtration of even the smallest particles. An additional activated carbon stage will also collect gaseous pollutants.
The contaminated air is collected by the collection unit (extractor hood, suction arm, hose, etc.) and transported into the filter unit directly or through a pipe or flexible hose. In the filter unit, the contaminant particles are filtered into different filter levels according to their size. Filter units that are equipped with a molecular sieve (for example activated carbon filters/BAC) remove the majority of gaseous contaminants. Afterwards the purified air can either be circulated back into the work area or diverted outdoors through an exhaust duct. Recirculating the air in the work area is an easy way to reduce energy costs.