When it comes to air filtration, the Minimum Efficiency Value (MERV) rating is an essential factor to consider. MERV indices range from 1 to 16, and filters with higher MERV indices are more effective at trapping small particles than those with lower MERV indices. A filter with a MERV rating of between 1 and 6 can remove particles between 0.3 and 10 microns with an efficiency of 20%. This means that it can capture dust mites, spray paint dust, carpet fibers, and pollen.
Using a filter with a higher MERV rating offers superior filtration, as it can trap everything from construction dust and tobacco smoke to bacteria. It is sometimes easier to remove the filter from the air treatment system, add another return filter, and install filters in the return grilles. A thicker filter is also less restrictive and will allow better flow of purified air. Air filters also help keep the furnace's coils and heat exchangers clean, which can extend the life of the oven and keep it running efficiently.
The highest MERV rating means an air filter will capture the most dust, while the lower rating means the filter will capture the least amount of dust. High-efficiency particulate air (HEPA) filters trap the smallest particles at a speed even higher than that of MERV 16 and are generally used in surgical operating rooms, clean rooms, and other contexts that require absolute cleaning. When selecting an air filter for your home or business, it is important to consider both the size of the filter and its MERV rating. Just choose the size of the air filter, decide how often you want to change it, and you'll be sure to get a filter that meets your needs. The use of a filter designed precisely for that purpose does not jeopardize the operation of the system if the filter is maintained regularly.
When used in a multi-filter system, prefilters trap dirt and large particles before the air reaches the final filters downstream, which remove the smallest particles. If you're thinking of using a thicker air filter to improve air quality, it might be best to focus on the MERV rating. If you're considering testing an air filter with a non-woven material similar to that used in N95 masks, make sure you create a lot of filter discs and change them after each exposure to several people.
