A Merv 8 filter is a superior filtration option compared to air filters with a lower MERV rating. It is designed to trap pollen, dust, dust mites, and mold spores. The filtration efficiency of a MERV 8 filter is classified by the National Air Filtration Association (NAFA). It must filter at least 70% of E3 particles (3.0-10.0 µm) and 20% of E2 particles (1.0-3.0 µm).
In addition, it also filters 30% of E2 particles and 1.9% of E1 particles (0.3-1.0 µm). The stop rate of a MERV 8 filter is 81.5%, meaning that 81.5% of the dust particles introduced into the filter are successfully filtered out of the air. These filters are made of 100% synthetic media and are effective at capturing common air pollutants between 3 and 10 microns in size, such as pollen, pet dander, lint, and dust mites. MERV ratings are based on how well an air filter traps common contaminants in the air within specific size ranges.
A MERV 8 filter is more than adequate for most households, but if you are concerned about outdoor air pollution, family members with respiratory problems, or pets in the house, then a higher MERV rating might be a good idea. When comparing a MERV 8 air filter to a MERV 11 air filter, it's important to consider the pressure drop and frequency of replacement. The pressure drop for a fiberglass filter is low because it is extremely porous and ineffective at filtering. A MERV 11 air filter may need to be changed more frequently than a MERV 8 air filter. MERV 8 filters are economical and easy to maintain, making them a popular choice for many households.
If you're still not sure which MERV filter is best for your home, talk to an HVAC expert who can guide you to the right selection.
