Box Fan Air Filter
The Puget Sound Clean Air Agency in Washington State has posted instructions for making a Do-It-Yourself Air Filter to remove particles from the air within your home. These “filter fans” can filter out the small particles that are common in wildfire or wood smoke. Particle pollution can lead to a number of immediate and long-term health impacts such as trouble breathing, asthma attacks, and lung and heart disease. Particle pollution is especially dangerous for children, the elderly, and people with sensitive immune systems. Testing found that: It takes 15 minutes to clear 90% of particles out of a small room (12'x12'), 25 minutes for a medium size room (12'x18'), and 2 hours for a large room (20'x35'). It takes 15 minutes at high speed to remove 90% of particles from a small room, 20 minutes at medium speed, and 35 minutes at low speed. A single filter is just as efficient as two filters stacked on top of each other. Using two filters in a triangle, so th...