Dust from a power plant (fly ash, reaction salt, coal dust) is extracted through a pipe line system which covers the whole block. The suction power is usually created by a stationary vacuum unit. If several blocks need to be cleaned, mobile suction units are used. The mobile unit is connected to the fixed pipeline system of the respective block where cleaning work is to be done.
Both mobile and stationary units can be equipped with explosion protection systems for explosive dust according to the Atex standard.