air purification

You maybe heard of Mr. Clean? Meet "Mr. Cleanerᵀᴹ" It's a common 20 inch box fan for 20 bucks as found almost anywhere. Attached to a badass, 4 inch thick, 20x20-inch, MERV-16 carbon-infused HVAC filter. So for around 80 bucks, I have made an air purifier that does as much or more than ones...