We know that most HEPA air filtration systems can filter between 87-99% of airborne particles and the more that a system can effectively filter your air, the more benefits it will have for your health and wellbeing. Alen offers one of the few True HEPA (H13) medical-grade filtration systems. Our air purifiers capture 99.99% of harmful particles
HEPA filters are classified according to the level of filtration capacity and are generally classified into G1 to H14 and other grades. For fine particles with a diameter of 0.3 microns or more, G1-F5 does not have any filtering effect, and the filtration efficiency of F6-H14 is from 20% to 99.999997%. F6-F8 is called medium efficiency air filter;
HEPA filters and COVID-19. HEPA (high efficiency particulate air) filters claim to filter particles down to 0.3 microns (0.3 micrometres, or 300 nanometres). Most viruses vary in diameter from a mere 20 nanometres (that's 0.02 microns, or 0.00002mm) up to 400nm (0.4 microns) – some are bigger still. Best Sellers in HEPA Filter Air Purifiers. #1. LEVOIT Air Purifier for Home Allergies Pets Hair in Bedroom, Covers Up to 1095 ft² by 45W High Torque Motor, 3-in-1 Filter with HEPA sleep mode, Remove Dust Smoke Pollutants Odor, Core300-P, White. 96,519. 12 offers from $60.50. #2.

MERV 16 Filter OVERVIEW: Not recommended for Homeowners. Simply put, MERV 16 filters are not ideal for most homeowners (as we’ll show below). Instead, homeowners are better served with MERV 13, or, in some cases, even lower. Here’s our full review on the MERV 16 air filters and why we recommend MERV 13 or lower, instead.

The DIY Box Fan Filter was able to drop PM2.5 particulates down 77%, the HEPA filter dropped the PM10 down 94.46%. After testing, I was impressed by how well the DIY Box Fan was able to remove particulates from the air. Yes, HEPA will provide more filtration, but if cost is an issue than the DIY MERV 13 Box Fan is a sensible choice.
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nano filter vs hepa filter