merv 8 4inch Size:20" x 20" x 4" MERV 11 means that the

MERV 11 means that the filter can stop 50% of particles larger than 1 micron and 90% of 10 microns particles

Original Manufacturer: Carrier

giving you truly fresh and clean air as your travel

Fits: Lennox

merv 8 4inch Size:20" x 20" x 4" MERV 11 means that theHigh Capacity Pleated Air Filter featuring mechanical MERV 8 performance at a very low, energy saving pressure drop setting the standard for performance. Mechanical media does not rely on a static charge to achieve efficiency rating Low pressure drop up to 50% lower than comparable products. This means a significant reduction in operating resistance which equals energy savings 28 point die cut frame with diagonal supports bonded to the media pack for