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!   / the3dhandyman   https://www.paypal.com/paypalme/3dhan... ====== 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/re... Article on PRO Filter Performance https://www.woodmagazine.com/tool-rev... Corsi-Rosenthal Article: https://www.texairfilters.com/how-to-... 3D PRINTED PARTS (Build at your own risk) Air Filter Clips: https://www.thingiverse.com/thing:536... Drum Fan Edge Clamps: https://www.thingiverse.com/thing:550... 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-ai... The 3D Handyman is a production of 2 Point Media. Stay classy!