DIY Air Filtration System! - Homemade Air Purifier - Simple "box fan" conversion! - very effective!. Homemade Air Purification System!. Simple "box fan" Conversion. Easy DIY. if you can't buy an expensive air purifier - build one! will remove up to 97% of all pollen, dust, mold, bacteria, smoke, smog... the list is almost endless. works as well (or better) than expensive systems costing $800-$2500. *sounds to good to be true but it's all backed by recent studies. check a "data filled" site called smartairfilters(dot)com for detailed studies, comparison tests etc. i used a "merv 4" dust filter and a merv 8 dust/allergen filter. (they go as high as merv 13+ for smoke and smog removal.). the dust filter alone removed all of the visible dust from several rooms in my home in only 20 mins. approx cost: $1 to $20 (depending on whether you have a box fan already). note that most newer fans don't have brushes in them so it doesn't matter if the fan motor has to work a little harder.
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