Air Filter MERV Ratings

Remember To Look For The MERV Rating For Your Air Filter

MERV here stands for Minimum Efficiency Reporting Value, a value that lets us know the size of particles an air filter is designed to catch. Higher MERV ratings are more likely to catch smaller particles. That’s why hospitals tend to use MERV 16 or higher, to capture the most pollutants possible.


Although lower MERV rated filters are less efficient overall, they allow more air to go through the filter, which can assist the operation of the HVAC system. It’s important to have the proper mix of air filter and MERV rating for your exact needs and your system. Call Mersey Heating and Air Conditioning in Toronto today to let our experts walk you through which MERV rating is needed for your home and family.


The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), which developed the MERV rating, recommends filters with minimum MERV ratings of 6. The U.S. Department of Energy recommends a minimum of MERV 13. For the best overall solution for most homeowners, acquire an Air Purification System, which comes with a MERV 16 media filter, and you’ll be in good shape for years.


Here’s how Air Filter MERV Ratings stack up:


  • MERV 1 to 4— <20% of large particles (3 to 10 microns) are captured
  • 5 to 7—Between 20% and 69% of large particles are captured
  • 8 to 10—Approximately 85% of large particles and 50% of small particles (1.0 to 3.0 microns) are captured
  • 11 to 16—More than 90% of large particles and between 70% and 90% of small particles are captured
  • 17 to 20—Even the smallest particles (< 0.3 microns) are captured


The right MERV rating on the right filter could really impact your indoor air quality, your health and your lifestyle. So selecting the right air filter matters. Call Mersey today at 416-752-8351. We offer a full range of air filtration choices, knowledge and expert service—and we’re here 24 hours a day for Toronto.

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