EZvacuum AC & Furnace Air Filters 16x20x1 Merv 7, 6-pack
MERV 7 filters are the perfect filters for those whose HVAC systems are a bit older. 16x20x1 MERV 7 filters are a medium grade filter with low resistance to airflow. The MERV rating system helps to understand the size of particles removed when air passes through the filters. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 52.2 standard test measures filter efficiency on particle sizes from .3 to 10 microns.Our MERV 7 filter has 50 - 69.9% efficiency when filtering airborne particles the size 3.0 â 10.0 microns. These filters are able to filter out mold, spores, hair spray, fabric protectors, dusting aides, cement dust, pudding mix, snuff and powdered milk, just to mention a few typical controlled contaminates. Our 16x20x1 MERV 7 filters are also able to filter out harmful swine flu viruses.Even though a filter has a low MERV rating, it does not mean that they are not beneficial to a home. After a few air changes, the efficiency raises greatly.Â ...