Replacement 401 SpaceGard Aprilaire 2400 Filter SG4-2PK

Replacement 401 SpaceGard Aprilaire 2400 Filter SG4-2PK Review

2pk Replacement Furnace Air Cleaner Filters for high efficiency air cleaners by Aprilaire and Space-Gard. These filters can cost up to per filter if you purchase through your heating contractor. This is the exact filter Lowe's and Home Depot sell for .99 each   High-Performance High-Output Micro-Free Gold HEPA-Type filter Easy Installation MERV 11, Exceeds Aprilaire OEM Filter specifications Manufactured by BestAir Equivalent Air Filter: Aprilaire: 401 Fits Models- Aprilaire and SpaceGard Air Cleaners: 2400 Lennox: PMAC-12C (X0577) #SG4 WHAT DOES MERV MEAN? ASHRAE which is the American Society of Heating, Refrigerating and Air-Conditioning Minimum Efficiency Reporting Value MERV 1-4 (Greater than 10 microns): pollen, dust mites, sanding dust, carpet fibers MERV 5-8 (3-10 microns): mold spores, hair spray, cement dust, powdered milk MERV 9-12 (1-3 microns): Legionella, lead dust, coal dust, auto emissions, welding fumes MERV 13-16 (0.3-1 microns): bacteria, tobacco smoke, insecticide dust, copier toner One micron equals one thousandth of a millimeter. To put it into perspective what particle sizes these filters will remove from the air, you need to consider that the thickness of human hair is between 50 and 100 microns! As shown above, a MERV 11 rated filter will remove particles that are down in the 1 micron size range! (That's 1/50th or 1/100th of the thickness of a hair!)