MAROT suction Model BD is used for simple "in-circuit" removal. The grains are distributed in a uniform flow curtain through which air is drawn.

The proportion of light impurities lifted from the grain is adjusted by varying the airflow through a flap that allows outside air to be bled into the top chamber before the fan.

Given its small overall size the BD suction pre-cleaner can easily be inserted into a drying or grain treatment line.