Smoke test every every 1, 2 and 4 inch air filter from 3M, K&N, Filter Buy, Nordic Pure, Aerostar, and HDX! We test standard box fan air filters, the Corsi-Rosenthal Designs, a pro HEPA filter to show which preforms the best and costs the least. MERV 8, MERV 11, MERV 13, MERV 14 are all tested! 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_ Air King 20in Box Fan (best performance): https://amzn.to/3Tbzl1O Lasko 20in Box Fan (best price, 20% lower performance than what is shown in this video): https://amzn.to/3c3nVNF _Pro HEPA Filters_ AirDoctor: https://amzn.to/3zd27Zd Blue Air 211: https://amzn.to/3OfXXpb _MERV 14 FILTERs_ 3M Filtrete 20x20x1(2 pack) https://amzn.to/3duBAxY Nordic Pure 20x20x2 (3 PACK): https://amzn.to/3Ovz8WJ _MERV 13 FILTERS_ 3M MERV 20x20x1 (4 pack) https://amzn.to/3DCrHIy Filter Buy 20x20x2 (4 pack) https://amzn.to/3hUCPbV _MERV 11 FILTERS_ K&N 20x20x1 (1 pack) https://amzn.to/3UN3mXo 3M 20x20x1 (4 Pack) https://amzn.to/3V4dUkD Nordic Pure 20x20x4 (1 PACK) https://amzn.to/3IPFSM1 _GAFFER TAPE_ Better than duct tape for making a Corsi Box https://amzn.to/3AR6E4Q _AIR QUALITY SENSOR_ Find out the air quality in your space https://amzn.to/3V4RZtt ====== LINKS ====== Particle Sizes: https://www.engineeringtoolbox.com/particle-sizes-d_934.html CBC Air filter test: https://www.youtube.com/watch?v=0uZKBlwLEFs&t=567s BUY 3D PRINTS (if you don't have a printer) https://www.etsy.com/shop/The3DHandyman