What does MERV stand for, and how does it relate to air filtration in BE applications?

• A. Maximum Efficiency Reporting Value; it rates the energy efficiency of HVAC filters.
• B. Minimum Efficiency Reporting Value; it rates the effectiveness of HVAC filters in removing particles, informing filter selection.
• C. Mechanical Efficiency Rating Value; it measures blower performance.
• D. Magnetically Enhanced Registered Value; it relates to filter magnetic components.

Answer: (B)

MERV stands for Minimum Efficiency Reporting Value, a rating that communicates how effectively a filter removes particles from the air across several size ranges. In BE applications, this helps you pick filters that meet indoor air quality goals while balancing energy use and system performance. Filters are tested with standardized aerosol challenges and the resulting efficiencies are reported in a single number. A higher MERV means better capture of smaller particles, which is important for reducing dust, pollen, smoke, and microbial aerosols, but it usually comes with a higher pressure drop, affecting airflow and energy use. So, choose a MERV that achieves the needed IAQ without overloading the system. For many offices, MERV 8–11 is common; for stricter IAQ needs, MERV 13–16 is typical. MERV measures filtration effectiveness, not energy efficiency, though energy impact is tied to the resulting pressure drop.