This may not seem like a significant difference compared to the MERV 8 filter, but a MERV 11 is also better able to capture between 65% and 79% of the smallest particles. Based on the above-mentioned characteristics, a MERV 8 is considered a superior filtration compared to air filters with a lower MERV rating. But is filtration enough? In many cases, a MERV 8 air filter is more than adequate. However, if you are concerned about outdoor air pollution, family members with respiratory problems, pets are in the house, then a higher MERV rating might be a good idea.
MERV 11 filters are more efficient than MERV 8 filters because they can capture smaller particles. They offer additional protection against pet dander, dust mites, self-emissions, and dust that damages the lungs. This is a good option for homes with pets or those looking for even better air quality than what the MERV 8 can provide. It's also our most popular type of air filter.
MERV values greater than 13 are generally for hospitals, manufacturing plants, and other environments that have high air quality requirements. MERV 11 filters are an excellent choice if you need to take your filtration to the next level without restricting airflow too much. Another option is to use a MERV 8 or 11 filter and add an air purifier to your home designed to remove impurities that cause allergies. Mathematics seems to tell you that if you want to have the best air quality you should buy a filter in the MERV 13-16 category and end the day.
They may seem to be almost the same, but MERV 8 air filters and MERV 11 air filters have a few different differences. These filters are slightly more restrictive than MERV 1-4 filters and have the ability to trap mold and pet dander spores along with dust and pollen. If you're worried about the effects of inhaling fine air particles, that's another reason to choose a MERV 11 air filter instead of a MERV 8 air filter. The best MERV rating for your home will depend on what you want to filter and the amount of airflow your HVAC system needs to operate.
The same applies to homes with smokers or pets, as MERV 11 air filters better eliminate odors. The MERV rating is there to tell you how efficient the air filter is at filtering particles of certain sizes. Filters in the MERV 5-8 range can also trap particles with a size of 3.0-10.0 microns, but are more efficient in doing so. In particular, using an air cleaner with a MERV rating that is too high can damage the compressor, heat exchanger, and air conditioner coil.
While ASHRAE recommends MERV 13 and 14, it's best to select a filter with the highest possible MERV rating for your specific HVAC system. Using an air filter with a MERV rating that is too high is just as bad as using one that is too low.
