The MERV efficiency rating scale ranges from 1 to 16, where 1 is the lowest efficiency and 16 describes the highest efficiency. The particle size range addressed by the MERV scale is 0.3 to 10 microns, making it certain that it is also at least as efficient when it comes to removing larger particles.
MERV 17+
filters are preferred in operating rooms, clean rooms and other indoor spaces that require significant air filtration. However, for homes and residential spaces, air filters below the MERV 16 rating are preferred.The MERV 16 rating indicates that it can easily remove particles as large as 0.3 to 1 micron. ASHRAE or MERV air filters are tested using dust spot tests, which incorporate fine dust, powdered carbon and some cotton liners. For most residential spaces, air filters in the MERV 11-13 range are perfect. In general, filters with a MERV rating of 16 or lower are considered suitable for air conditioning systems for residential, commercial and general hospital use.
When looking for the best home air filter, you can find recommendations for both MERV and HEPA air filters. However, using an air filter with a MERV rating higher than that recommended by the boiler or air conditioner manufacturer may affect its performance. The minimum rated efficiency value (MERV) rating of an air filter measures how effectively the filter prevents dust and other contaminants from passing through the filter and reaching the air stream. Air filters with a MERV 11 or MERV 13 rating are often beneficial for people with asthma and allergies, as well as for homes with pets.
The following table lists some of the air contaminants that air filters can capture according to the MERV classification:
- MERV 1-4: Pollen, dust mites, carpet fibers
- MERV 5-8: Mold spores, pet dander
- MERV 9-12: Bacteria, smoke particles
- MERV 13-16: Virus carriers, aerosolized oils
Air filters with a MERV 11 or MERV 13 rating are usually sufficient for most homes and offices.
