What Inlet Do You Use to Comply with USEPA Designation? The following summary may be useful: 1. All currently designated USEPA Class III PM 2.5 FEM single-channel ambient particulate monitors must incorporate the BGI VSCC PM 2.5 fractionator in order to remain designated. 2. If the BGI VSCC PM 2.5 fractionator in a designated Class III PM 2.5 Federal Equivalent Method is replaced with a WINS impactor or a standard sharp cut cyclone, it is no longer a USEPA designated Class III PM 2.5 equivalent method. 3. The only USEPA Class III PM 2.5 FEM made by Thermo-Fisher that does not employ the BGI VSCC is the seldom used double-channel 1405DF TEOM. There are 3 commonly used PM 2.5 particulate matter separators used on single-channel continuous monitors such as the Met One BAM-1020 beta attenuation mass monitor. These are the WINS Impactor (also known as the size-selective inlet – “SSI”) and the sharp cut cyclone, which is pr
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