I answered that, the blower creates vaccum this causes Air rush to blower and the Air is entered in the fbd through apu, in apu the Air is traveled through various process, 1st the Air goes to pre-filter after that chilling coil, fine filter, heating coil and then hepa filter which is filtered Uptp 0.3 micron. After that the finger bag shake because of the Air throw UP the product, some product are remains in bag and the whole process is completed.