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Flanders
The world's largest manufacturer of air filtration solutions, operates production, warehousing and distribution facilities in 22 countries across four continents. With its global headquarters in Louisville, Kentucky, AAF Flanders is committed to protecting people, processes and systems through the development and manufacturing of the highest quality air filters, filtration equipment and containment housings available today

Disposable Fiberglass & Poly Filters
Disposable Fiberglass
& Poly
Pleated Filters
Pleated
Rigid Cell Filters
Rigid Cell
Bag Filters
Bag

Cut-It-Yourself Filters
Cut-It-Yourself
Disposable Carbon Filters
Disposable Carbon
HEPA & ULPA Filters
HEPA & ULPA
Automatic Roll Filters
Automatic Roll


What Does MERV Mean?

What Does MERV Mean
MERV, standing for Minimum Efficiency Reporting Value, is a guideline to determine a filters performance by particle size, ranging from 0.3 to 10 microns in size. This value is based on the lowest, or minimum efficiency for the filter. In many cases this is when the filter is first installed. Generally, the higher the MERV, the better the filter will perform at removing smaller particle sizes.

MERV 1 through 4 filters are designed to remove larger particle sizes. These filters are used to mainly protect equipment and are used in light commercial and residential applications. For these values, the average particle size efficiency from 3 to 10 microns is less than 20%. Because of this, average arrestance, which is a measure of a filter's ability to remove coarse particulate, is used to determine MERV 1 through 4.

MERV 5 through 16 filters remove finer particles and are used in applications where it is important to protect individuals or processes from airborne contaminants that could otherwise affect health and productivity. MERV 5 through 16 is determined by particle size efficiency. The average particle size efficiency in three ranges: E1 (0.3 to 1 micron), E2 (1 to 3 micron) and E3 (3 to 10 micron) will determine MERV for these products.