take a look atthis guidewhich breaks down MERV, MPR, and FPR filter ratings. While changing the filter is simple the area around the filter in the plenum can also become dirty. For dust and loose debris, you can simply use a vacuum cleaner with a hose attachment but will need...
Both Burken and Segal spoke highly of HEPA filters used in common household appliances, like furnaces and air conditioners. Burken also advised checking the MPR (microparticle performance rating) and MERV (minimum efficiency reporting value) on these products. "We tested a 3000 MPR with multiple ...