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From Washington state’s department of ecology. “Make your own clean air fan”

Narrator: You can easily make a do it yourself air cleaner to remove tiny, harmful particles in bad air. Lay a 20 inch box fan face down. Put a 20 inch furnace filter, with a MERV rating between 11 and 14 on the back of the fan, where the air comes in, with the flow arrows pointing to the front.

Hold the filter in place with a bungee cord. And that’s it! Use it in a small room, with the windows and doors closed. As the same air keeps moving through the filter, it captures more and more harmful particles. Don’t put it in an open window, it will pull in more bad air.

Tests have shown the tiny particles in the room are greatly reduced using this fan and filter. Check and change the filter when it gets dirty. The filter may make the fan work harder and get hot, so turn it off when you’re not home.

Find out more on our website: ecology.wa.gov