Recirculated air-operation means that air that has already been filtered is returned to the work area. In order to avoid additional hazards for the employees, legislators regulate the possibilities for air recirculation. The corresponding standards vary from country to country. In general, the possibility of recirculated air-operation depends on the separation efficiency. In many cases, air recirculation is permitted if the purified air falls below 1/3 of the permissible workplace limit value. The situation is different for air recirculation when handling carcinogenic substances.
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