What is the best DIY Air Filter?

Let's test every DIY and Pro Shop air filter out there. What's the best? We will find out! We test standard box fan air filters, several Corsi-Rosenthal Designs, the standard pro models, and my two designs (plans below). Buy Kits here: https://www.etsy.com/shop/The3DHandyman Support the channel! https://www.patreon.com/the3dhandyman https://www.paypal.com/paypalme/3dhandyman ====== SHOPPING LIST ====== (buying from these helps the channel) _FANS_ Lasko 20in Box Fan (best price): https://amzn.to/3c3nVNF Air King 20in Box Fan (best performance): https://amzn.to/3Tbzl1O Caterpillar FAN: https://amzn.to/3TD9NM3 Maxx Air Fan: https://amzn.to/3fXokQC _Pro Air Filters_ AirDoctor: https://amzn.to/3zd27Zd Shop Fox: https://amzn.to/3aLEKwk Jet 1000: https://amzn.to/3PUJ7nZ _MERV 14 FILTERs_ Nordic Pure 20x20x1 (12 PACK): https://amzn.to/3O6GGgr Nordic Pure 20x20x1 (6 PACK): https://amzn.to/3o5Ge7E Nordic Pure 20x20x4 (1 PACK): https://amzn.to/3AYyiwC 3M Filtrete 20x20x1(2 pack) https://amzn.to/3duBAxY _MERV 13 FILTERS_ 3M Filtrete 20x20x1(4 pack) https://amzn.to/3hUCPbV _MERV 12 FILTERS_ Nordic Pure 20x20x1 (6 Pack): https://amzn.to/3O6HaTN Nordic Pure 20x20x4 (1 PACK): https://amzn.to/3crRhpm _MERV 8 FILTERS_ Nordic Pure 20x20x1 (6 Pack): https://amzn.to/3Rz9T6G Nordic Pure 20x20x4 (1 PACK): https://amzn.to/3IPFSM1 _GAFFER TAPE_ Better than duct tape for this use https://amzn.to/3AR6E4Q _DIGITAL ANEMOMETER_ For testing wind speed https://amzn.to/3OkzmhF ====== LINKS ====== Airflow was calculated here: https://www.cuidevices.com/product/resource/calculators/airflow-conversion Article on PRO Filter Performance https://www.woodmagazine.com/tool-reviews/dust-collection/air-filtration-systems Corsi-Rosenthal Article: https://www.texairfilters.com/how-to-improve-the-efficiency-of-the-box-fan-and-merv-13-filter-air-cleaner/ 3D PRINTED PARTS (Build at your own risk) Air Filter Clips: https://www.thingiverse.com/thing:5366495 Drum Fan Edge Clamps: https://www.thingiverse.com/thing:5501226 BUY 3D PRINTS (if you don't have a printer) Air Filter Clips: https://www.etsy.com/listing/1210663842 Drum Fan Edge Clamps: https://www.etsy.com/listing/1287743212 BUILDING PLANS for 8 Filter Design (BUILD AT YOUR OWN RISK) https://the3dhandyman.com/workshop-air-filter-drawings/ The 3D Handyman is a production of 2 Point Media. Stay classy!