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Filter Efficiencies

MERV Rating

Bonded Filter Co.’s patented PleatLink® is available in a MERV 8, MERV 11, and MERV 13 configuration.

Minimum efficiency reporting value, commonly known as MERV rating, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate the effectiveness of air filters.  The Minimum Efficiency Reporting Value (MERV) must be stated with the air velocity at which the filter was tested.  ASHRAE Standard 52.2 (MERV) tests are to be conducted at one of seven airflow rates from 118 FPM to 748 FPM with 492 FPM being the most common reference point.

The scale represented a quantum leap in the precision and accuracy of air-cleaner ratings.

The scale is designed to represent the worst-case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometers. The MERV rating is from 1 to 16. Higher MERV ratings correspond to a greater percentage of particles captured on each pass, with a MERV 16 filter capturing more than 95% of particles over the full range.

ASHRAE Standard 62.1-2013 recommends a minimum MERV 6 for commercial applications. Current industry standard for most applications is a MERV 8.

MERV 8 Filters

MERV 8 filters have an average Particle Size Efficiency (PSE) greater than or equal to 70% at removing particulate matter  from 3.0 to 10.0 µm.  Some of the particles included in that size range are: spores, dust mite debris, mold, dander, fabric protector, human hair, carpet fibers.

MERV 13 Filters

MERV 13 filters have 75% particle size efficiency (PSE) at removing particulate matter from .30 to 1.0 µm, and a PSE equal to or less than 90% at removing particulate matter from 1.0 to 10.0 µm.

It’s important to note that of the 16 MERV values, only MERV 13, 14, 15, and 16 can effectively filter 0.3 to 1.0 µm particles. However, that doesn’t mean they are better simply because they can remove more particulate matter. It is important to choose a filter based on the needs of the facility.

In large office spaces, air quality and how it contributes to the health of the workspace are of the utmost importance. Bacteria and sneeze droplet nuclei are some of the smallest particles and most harmful particulate matter, but can be effectively filtered out using MERV 13 filters.

MERV 13 filters also carry other benefits in that the installation of such filters can help achieve LEED™ certification.