Respirable aerosol sampling is performed using a cyclone and filter sampler. Sampling for respirable aerosols should be performed in the same manner as sampling a filter except: 1. Calibrate each pump at the flow designated by the type of cyclone being used with a representative cyclone and filter in line. Note that the filter is mounted upside down with the cyclone in place. 2. Inspect the interior of the cyclone. If there is visible scoring or damage inside, discard the cyclone since the dust separation characteristics may have been altered. See more on our website.