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But what is MERV rating, exactly? An air filter’s minimum efficiency reporting value (MERV) rating measures how effectively the filter stops dust and other contaminants from passing through the filter and into the air stream. Filters with higher MERV ratings trap small particles more effectively than filters with lower MERV ratings.What happened to Merv?
Yet while Cairo and Baghdad are still going strong (though Baghdad spent most of the time after its destruction by the Mongols in 1258 as a mere provincial town), what of Merv? In fact, the historic city of Merv was totally wrecked 230 years ago in 1785—though it was already in a state of decline before then.What is the difference between MERV 13 and MERV 14?
Generally speaking, anything under a MERV 13 air filter should provide very efficient air purification in a home without impacting airflow. Meanwhile, air filters with a MERV 14 rating or higher are designed for commercial HVAC systems that can handle the thicker filter material. A MERV 11 air filter can trap and block the following:Is Merv 11 too high for your needs?
A MERV 11 air filter has a higher efficiency rating. Meaning, it can capture finer particles and clear more contaminants out of the air. But is MERV 11 too high for your needs? Using an air filter with a MERV rating that’s too high is just as bad as using one that’s too low.