text: The first step in filter selection is to determine what the objective is for the filtration system. What is the “target” particle size for the application? As an example, the target particle size in most health care facilities is one micron because 99% of all known bacteria are one micron larger.
  Once the objective has been determined, our ASHRAE 52.2 Test Report will be useful in determining which MERV efficiency will remove the target sized particles. More detailed efficiency numbers can be found in the ASHRAE 52.2 Test Report. Filters with a MERV 13 and higher typically utilize a pre-filter to maximize their service life and minimize cost.
  Midair Industrial can help in the process of filter selection by having one of our factory-trained sales representatives assist in the process of identifying the target particle size and then develop those identified objectives into a filtration protocol.
  Ask us how we can help with your Covid-19 solutions.