AAF Flanders Filters
AAF Flanders is the world's largest provider of HVAC, air filter and custom air filtration products with warehousing and distribution in 22 countries across 4 continents. Flanders manufactures pleated filters, fiberglass filters, Hepa, high merve rated filters, bag, roll filters, rigid filters and also made to order custom filters. AAF Flanders has an air filter solution for you.
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AAF Flanders Disposable Fiberglass & Poly Filters
Disposable Fiberglass
& Poly Filters
AAF Flanders Pleated Filters
AAF Flanders Rigid Cell Filters
Rigid Cell
AAF Flanders Bag Filters

AAF Flanders Cut-It-Yourself Filters
AAF Flanders Disposable Carbon Filters
Disposable Carbon
AAF Flanders HEPA & ULPA Filters
AAF Flanders 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.