The numeric MERV performance is a function of a filter’s or air cleaner’s ability to capture particles as small as 0.3 microns at a given rate per MERV rating. The MERV chart below shows that to perform at a MERV 13 level the filter captures less than 75% of particles at 0.3 and 90% or better of the larger particles. The 3^rd party testing of the Polarized Media Air Cleaner provided below shows its efficacy being in the range of a MERV 14 to a MERV 16 filtration level.