how HEPA filters work - (high efficiency particulate air)
pretty simple instructions on making a very efficient air filter, HEPA... you can use a larger milk jug with larger inner tubing. just make the ...
Home made HEPA filter for home use.
Hepa air filter made for the home, I spent 2.50$ to make it, I recycled a used milk jug, a used m&m mini tube, some cotton balls, and vacuum ...