The environment air is drawn from the top of the modules via a G3 pre-filter and then pulled downwards through the absolute H14 HEPA/ULPA filters and goes down as laminar flow into the working area. From here at floor level as well as from the front opening this air is completely exhausted.
The air is then recirculated outside the strip curtains (that have to contain the air flow) and sucked by the pre-filters in the top area.