When it comes to air filters, there are a few different ratings that you should be aware of. Minimum Efficiency Report Values (MERV), Microparticle Performance Rating (MPR) and Filter Performance Rating (FPR) are all important factors to consider when selecting the right filter for your home. MERV ratings measure the ability of a filter to capture particles between 0.3 and 10 microns in size. Filters with a MERV rating of 1 to 7 are considered to be of medium efficiency and can be used in homes without allergies or pets.
However, most homeowners opt for an air filter with a higher MERV rating as it is more efficient at removing smaller particles. MPR ratings measure how well an air filter can capture particles smaller than one micron. A filter with a 600 MPR rating captures dust, while one with a 1500 rating can block smaller allergens. FPR ratings indicate the ability of a filter to trap larger particles such as household dust and lint, dust mites, pollen, and pet dander.
FPR 4 and 5 filters begin to trap these contaminants, while MERV 8, 11 and 13 filters cover the normal range of household needs by providing clean air and protecting air conditioning equipment.
MERV 8filters typically filter 90% of particulates from the air, MERV 11 can remove around 95%, and MERV 13 can block approximately 98%. An FPR four filter usually lasts about six months, while an FPR of six or more can last one to three years, depending on the degree of air pollution. However, if the MERV rating is too high (above MERV 1), it can increase system backpressure and block air flow through the central air system, worsening the efficiency of the air conditioning system. Choosing the right air filter for your home is essential for maintaining good indoor air quality.
It is important to understand the different ratings associated with air filters so that you can make an informed decision when selecting one for your home. By understanding MERV, MPR and FPR ratings, you can ensure that you are getting the best possible filter for your needs.