When it comes to keeping your home's air clean, it's important to choose the right air filter. The MERV rating of a filter is a key factor in determining how effective it will be in trapping particles such as pollen, pet dander, and fine dust. MERV ratings range from 1 to 16, with higher ratings indicating a better ability to filter out contaminants. MERV 8 filters are known to be effective in filtering out many common pollutants, but if you want even cleaner air, you may want to consider a medium-efficiency MERV filter such as the Nordic Pure MERV 12. When it comes to changing your filter, it's important to make sure that the dust trapped in the filter is not visible.
If it is, then it's time for a new one. High MERV ratings indicate that the filter does a good job of removing particles from the air. If your heating and air conditioning system uses a thicker filter (typically 4-5 inches), then it's likely designed for medium-efficiency MERV filtration. MERV 17-20 filters are typically used in industrial or scientific applications, such as surgical operating rooms and clean rooms.
These filters are more restrictive than lower MERV filters when it comes to airflow, as measured by the drop in air pressure created by the filters when installed. In the real world, the cumulative effect of filters increases over time as air recirculates through ducts and passes through filters each time. For example, a study found that 81.5% of dust particles introduced into a filter were successfully filtered from the air. If you're looking for an air filter with a specific size, thickness, and MERV rating, Filter King's filter selection tool can help you find exactly what you need.
With the right filter in place, you can rest assured that your home's air is clean and healthy.