The EPM 797 system uses an air-driven aspirator which extracts the sample from the stack. It is then passed consecutively through a coarse and fine particulate filter, a pre-selected glass or quartz critical orifice and diluted with the air from the aspirator. This process reduces the dew point of the stack sample to below that of the ambient air. This item is also available for rent from CleanAir Europe.  Purchase a Dilution Control Panel.