There are many types of air purification systems available to homeowners and commercial facilities, and understanding the effectiveness of each may seem overwhelming. Fortunately there is a measure that helps quantify how air purification filters perform. The Environmental Protection Agency (EPA) established minimum efficiency reporting values, or MERVs, that rate a filter’s ability to capture particles between 0.3 and 10 microns. This value can help you determine the right type of filter for your building. Read more at THERMA >>