A wesp is used on exhausts that contain wet, sticky, tarry, tacky or oily particulates. The wesp is an old technology originally designed in the 1920's to collect sulfuric acid mist using lead collection tubes. Today, the wesp is employed on gas streams that include oily and sticky particulates or gas streams that must be cooled to saturation in order to condense aerosols that were formerly in the gas phase. Due to the different characteristics of the collected precipitate, the mechanical removal systems (rappers and vibrators) in a dry system are not effective. Visit our internet homepage for more research information at www.ppcbio.com.