MERV Rating 9-12 A MERV 9 will trap less than 50% of particles of size 1, 0-3.0 microns, MERV 10 will stop up to 64%, Merv 11 will get up to 79%, and MERV 12 is capable of up to 89%. Merv 11 air filters trap 79% of particles 1 to 3 microns in size and 85% of particles 3 to 10 microns in size. The important relationship between MERV and Airflow. Merv 11 air filters are a little more expensive than a standard filter, but paying a few extra dollars per filter is usually worth it for the added efficiency.
Some situations warrant a higher MERV 11 rating. If someone has an allergy or respiratory problem, use a MERV 11 air filter or even a merv 13 air filter. The same applies to households with smokers or pets, as MERV 11 air filters better eliminate odors. Filters that are MERV 16 to 20 are usually only found in hospitals, cleanrooms, and nuclear power plants.
Each air filter has its advantages and disadvantages, but both MERV 8 air filters and MERV 11 air filters are suitable for residential use. MERV 8 air filters are very common because it is a fairly complete option, so you might think that they have a good price but a poor performance. The worst percentage of the six tests is selected as the official measure used to determine the MERV rating of a filter. The goal of using a MERV 12 or higher filter is a better IAQ: cleaner, more breathable air for everyone, and especially for those with allergies, asthma, COPD, etc.
The higher the merv index of a filter, the less dust particles and other contaminants can pass through it. E1, E2, and E3 particulates are particle range sizes used in air filter testing to determine a MERV rating. Next, I'll discuss what you need to consider when selecting an air filter and which MERV rating is best for your home. A filter with a MERV rating of around 10 to 12 is enough to remove most allergy-causing particles from your home's air.
It is best to adhere to the oven manufacturer's recommendations or consult an HVAC professional to determine exactly which MERV rating is best for your specific system. The main difference between the MPR and MERV rating systems is that the MPR rating system focuses on the effectiveness of a filter in removing E1 microparticles from the air. If your HVAC has a permanent split condenser fan, a higher MERV rated air filter will interfere with it and cause lower airflow. Choosing the right MERV rating is an important decision in terms of overall cost, air quality, and product durability.
The Minimum Efficiency Report Value (or MERV) is a rating system used to compare filters manufactured by multiple manufacturers. The MERV rating of an air filter is a scale from 1 to 16 that describes the minimum efficiency of the air filter.