What is MERV rating on HVAC Filters?

Written by Steve Todd in Facility Management,Glossary


What is MERV rating on HVAC filters?

MERV stands for “minimum efficiency reporting value” and indicates how well a particular air filter will be able to filter out particles from the air. MERV ratings range from 1-16. A higher number is better; filters with higher numbers can filter out smaller particles. Most HVAC units will use a filter with a MERV rating of between five and 12. These air filters can catch things like pollen, dust particles, pet dander, mold, and carpet fibers – Climate ControlOpens in a new tab.

MERV means Minimum Efficiency Reporting Value which was developed by the American Society of Heating, Refrigeration and Air Conditioner Engineers – ASHRAE. MERV ratings vary from 1 to 16. The higher the MERV rating, the more efficient the filter will be in trapping airborne particles. Another consideration is air flow through the HVAC system. Leaving a dirty air filter in place or using a filter that is too restrictive may result in low air flow and possibly cause the system to malfunction- CoolRayOpens in a new tab.

The Minimum Efficiency Reporting Value, or MERV, is a third-party rating system for HVAC filters. It provides a means for consumers to compare the effectiveness of various filters. The higher the MERV number, the more effective a filter is at removing contaminants. Most residential furnaces  are equipped with, and work well with, a 1” thick filter that is MERV-rated 3 to 5, or a 4” or 5” thick media type filter that is MERV-rated 6 to 8- CarrierOpens in a new tab.

Steve Todd

Steve Todd, founder of Open Sourced Workplace and is a recognized thought leader in workplace strategy and the future of work. With a passion for work from anywhere, Steve has successfully implemented transformative strategies that enhance productivity and employee satisfaction. Through Open Sourced Workplace, he fosters collaboration among HR, facilities management, technology, and real estate professionals, providing valuable insights and resources. As a speaker and contributor to various publications, Steve remains dedicated to staying at the forefront of workplace innovation, helping organizations thrive in today's dynamic work environment.

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