Fan filter group FFU function and principle?

FFU laminar flow air supply unit can be connected to the module, making the FFU widely used in clean rooms, clean bench, clean production lines, assembly-type clean room and laminar flow hood applications.
FFU with the beginning of the two-stage filter efficiency filter. Fan from the top of the FFU inhaled air and through the early, high-efficiency filter after the clean air in the whole wind surface to 0.45m / s + 20% of the wind speed uniform delivery.