![INEXPENSIVE FILTRATION](https://carnicominstitute.org/wp/wp-content/uploads/fan4.jpg)
INEXPENSIVE FILTRATION
Included here is a homemade filtration device (a box fan with a furnace filter attached) that is effective in filtering particulates down to 5-1- microns in size. Though not intended to be a substitute for a HEPA filter (filtration down to .3 microns), this construct is a simple and inexpensive means to improve air quality in a room or other controlled environment. Pictures of the filter after being use for up to 6 weeks are included.