what is the difference between merv 6 and merv 8?
The smaller the particle size in microns, the bigger the MERV rating you'll need to catch it. ... MERV 5–8 (good): These filters are better at catching small particles (3–10 microns) like mold spores, hair spray, dust mites and animal dander. MERV 9–12 (better): The best option for residential use.