MERV (Minimum Efficiency Reporting Value) Ratings and Filters

2 Responses

  1. Harry Powell says:

    Why does a PDF I found mention 52.5? in a MERV rating chart? Looks like an ANSI/ASHRAE standard but the nearest I can find is 52.2. The document I found says MERV 16 is .30 – 1.0 pm.. Picometers? Cant be, shouldn’t it be µm (micrometer, = 1000 picometer). If it were .30 – 1.0 pm it would stop SARS-CoV-2 virus particles, which are 100 nanometers or 0.1 µm. MERV 20 would be borderline at best, assuming 0.1 pm meant 0.1 µm for MERV 20.

    • admin says:

      Mr. Harry Powell,

      >Why does a PDF I found mention 52.5? in a MERV rating chart?

      Without seeing the technical document or context of what you are talking about, I have no idea how to answer this.

      Furthermore I no longer offer consulting to residential or homeowners.

      JAG of ScanTech

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