Stationery electrostatic filter unit is especially designed for use at fixed welding workstations, training workshops, welding cabins, or everywhere else where floor space is tight. This unit can be mounted to the wall, a column, or even to a freestanding pillar. It is used to filter and extract hard to capture substances. Bigger particles are first captured in a pre-filter. The remaining substances are then carried through ionisation wires. After that, the particles enter the main filter area containing the actual collecting sheets. These sheets are negatively charged and separate the particles from the air with a maximum in efficiency.