Replacement Generic Furnace Air Cleaner Filter for high efficiency air cleaners by Aprilaire and Space-Gard. The genuine Space-Gard fileter manufactured by Aprilaire is rated at MERV10, The filters we are seling at rated at MERV11, They exceed the OEM factory filter. These filters can cost up to $40 per filter if you purchase through your heating contractor. 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: 201 Generalaire 12880 Fits Models- Aprilaire and SpaceGard Air Cleaners: 2200, 2250 Bryant: 902B Carrier: 31MF Generalaire: AC1 Lennox: PMAC-20C (X0579) Actual Size 24 7/8" x 6" WHAT DOES MERV MEAN? ASHRAE which is the American Society of Heating, Refrigerating and Air-Conditioning Engineers recently amended their Standard 62 to require 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 micro
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