When it comes to air filtration, MERV 13 and HEPA filters are two of the most popular options. While they both remove particles from the air, they work in different ways. MERV 13 filters are designed to capture particles larger than 0.30 microns, while HEPA filters are designed to capture particles smaller than 0.30 microns. This means that HEPA filters are more effective at capturing smaller particles, such as those found in the air during the COVID-19 pandemic. The MERV rating of an air filter describes its efficiency in reducing the level of particles by 0.3 to 10 microns in the air passing through the filter.
MERV 11-13 filters are generally beneficial for people with asthma and allergies, as well as for homes with pets. ASHRAE or MERV air filters are tested using Dust Spot tests, which incorporate some fine dust, powdered carbon and some cotton bolts. HEPA filters have one major advantage over MERV 13 filters: they can capture 99.7% of 0.3 micron particles, while MERV 13 filters can only capture up to 75%. This makes HEPA filters the ultimate solution in the world of air filters and far exceeds what a MERV 13 can do. However, HEPA filters also have one major drawback: they limit the amount of air that can pass through them. When it comes to choosing the best home air filter, it is important to understand the differences between MERV and HEPA filters.
MERV 17+ filters are preferred by operating rooms, cleanrooms and indoor spaces that require significant air filtration due to their ability to capture small particles. However, many existing HVAC (heating, ventilation and air conditioning) systems may not be able to adopt a MERV 13 due to the increased load on the fan due to the finer filter medium. In conclusion, while any air filter is better than no air filter, you'll find that the air filters in the MERV 11-13 range are perfect for most residential spaces. For areas that require more significant filtration, such as operating rooms or cleanrooms, a HEPA filter is recommended due to its superior ability to capture small particles.
