This video discusses the purpose of the cascade impactor, how to disassemble and reassemble it, push and pull flow requirements from the Supplemental Flow Units, and how to connect it to the Inhalation Tower for the purposes of measuring particle size.  

Next video:  https://support.datasci.com/hc/en-us/articles/360051910313-Inhalation-Tower-Video-20-Inline-Gravimetric-Filter-Assembly