Appliance Science: HEPA filters and the physics of fresh air - CNET | Ciencia-Física | Scoop.it
From www.cnet.com - April 23, 2015 2:28 PM
HEPA air filters promise to take nasty things out of the air, removing cigarette smoke, pollen and other irritants. How do they do this? Appliance Science looks at how HEPA air filters work, and how to tell the real from the fake.