When it comes to air filters, the MERV rating is an important factor to consider. The MERV rating indicates how efficient the air filter is at filtering particles of certain sizes. A MERV 8 air filter and a MERV 11 air filter both have their advantages and disadvantages, but both are suitable for residential use. The MERV 11 air filter is not the best choice for those who don't have pets or respiratory issues, as it can cause airflow restriction.
Air filters with higher nominal values can also have a negative impact on components of air conditioning systems. However, if you're worried about outdoor air pollution, the presence of family members with respiratory problems, or the presence of pets at home, it might be wise to go for a higher MERV rating. Choosing the right MERV rating is an important decision in terms of total cost, air quality and product durability. MERV 11 air filters can filter a large percentage of fine particles, but a MERV 8 air filter cannot.
If someone has an allergy or respiratory problem, use a MERV 11 air filter or even a MERV 13 air filter. As the MERV rating increases, the filter tends to become denser and denser to capture more air contaminants, which could cause slightly greater atmospheric restriction. The MERV 13 filter consists of the latter including greater protection against airborne bacteria and viruses that spread through airborne droplets. Many pleated HVAC air filters can still have a high MERV rating, without drastically restricting airflow.
If you're concerned about the effects of inhaling fine air particles, that's another reason to choose a MERV 11 air filter over a MERV 8 air filter. If you're trying to decide between a MERV 8 air filter and a MERV 11 air filter, use a MERV 8-13 filter depending on your family's needs and environment. Start using an indoor air quality monitor to help you determine if a separate air purification system is needed.
