When it comes to air purification, two main types of filters are used: FPR (Filter Performance Rating) and MERV (Minimum Efficiency Reporting Value). FPR ratings range from four to six, with four being the lowest and six being the highest. An FPR filter of four typically lasts around six months, while an FPR filter of six or more can last one to three years, depending on the degree of air pollution. MERV ratings, on the other hand, range from 1 to 16. The higher the rating, the better the filter is at capturing fine particles. For instance, a MERV 11 air filter can capture a wider range of particles than a MERV 8 filter.
A MERV 13 air filter is around 98% effective at removing particulate matter from the air. Newer units shouldn't have airflow problems with higher MERV ratings, although older models may work harder with a MERV 13 filter installed than when they originally had a MERV 6 filter in the air intake. Most residential areas can remove contaminants from MERV 8 to MERV 13, while most hospitals use MERV 14 and MERV 20.
