In this video, I present a staggering amount of evidence demonstrating that HEPA air purifiers are not as effective as Corsi-Rosenthal Boxes and other DIY air purifiers. I also talk to Wayne Westerman and Rob Wissmann, co-founders of the company Clean Air Kits that sells air purifiers that are quieter, more powerful, more energy efficient, and cheaper than commercial HEPA air purifiers. That's right: you DON'T have to build a DIY air purifier yourself!
Note: This video is NOT sponsored.

This video is a journey. By the end of it, you'll learn exactly how to dramatically improve your indoor air quality by using air purifiers (AKA air cleaners). You'll also learn why you should. You'll learn about a better metric to evaluate air purifier performance so you can never be scammed into buying an ineffective unit again (Clean Air Delivery Rate, or CADR).

0:00 - Intro
1:35 - Research on the health impacts of particulate matter (PM)
3:43 - Why I started getting skeptical about HEPA Air Purifiers
6:12 - Clean Air Delivery Rate (CADR): a better way to measure air purifier performance
7:28 - How can HEPA air purifiers capture virtually all particles, but still leave the air dirty?
10:05 - What are the tradeoffs of the high efficiency of HEPA?
10:36 - Most HEPA brands don't even report CADR
11:05 - Some HEPA brand DO report CADR. Can we trust that number?
11:29 - RESEARCH STUDIES showing that DIY air purifiers (CR boxes) with MERV-13 HVAC filters are better than HEPA
15:31 - Can HVAC filters capture ultrafine particles?
18:08 - Why HEPA efficiency may not be as high as 99.97%
19:16 - Can CR boxes protect us from viral transmission?
20:03 - How CLEAN AIR KITS makes a quieter air purifier (PC fans)
22:18 - How do clean air kits compare to CR boxes and HEPAs?
24:00 - How can clean air kits be safer than HEPAs with comparable CADR?
25:44 - WHICH AIR PURIFIER SHOULD YOU BUY?
27:59 - BEFORE BUYING: how to size an air purifier to a room
29:42 - Wayne's air purifier layout strategy for viral transmission (THE EXHALARON)
31:42 - Are HEPA filters useful in other contexts?
32:09 - Are activated carbon filters and prefilters necessary?
33:29 - CALL TO ACTION

BUY FROM CLEAN AIR KITS:
https://www.cleanairkits.com/

Scientific research:
Ratliff et al: https://e9i3r2v2.stackpathcdn.com/wp-...
Myers et al: https://www.tandfonline.com/doi/figur...
Dal Porto et al: https://www.medrxiv.org/content/10.11...
Srikrishna et al: https://www.ncbi.nlm.nih.gov/pmc/arti...
Holder et al: https://pubmed.ncbi.nlm.nih.gov/36437...
Review of numerous papers: https://ncceh.ca/resources/evidence-r...
Azimi et al: https://www.sciencedirect.com/science...
Stephens et al: https://pubmed.ncbi.nlm.nih.gov/23590...
Chang et al: https://aaqr.org/articles/aaqr-16-10-...
Pawel Misztal's presentation (the figures about PM and mortality rate): https://tamest.org/wp-content/uploads...

EPA article: research on DIY Air Cleaners to Reduce Wildfire Smoke Indoors: https://www.epa.gov/air-research/rese...

Simple way to size an air cleaner (AHAM’s 2/3 rule): https://ahamverifide.org/ahams-air-fi...

Air cleaner selection tool: https://cleanairstars.com/filters/

Joey Fox’s amazing articles:
Is HEPA necessary for portable/in room air cleaners? https://itsairborne.com/hepa-filters-...
CADR is all that matters: https://itsairborne.com/clean-air-del...
Are extra features in air cleaners necessary? https://itsairborne.com/how-to-pick-a...

David Elfstrom’s article on how to do your own CADR test: https://itsairborne.com/how-to-measur...

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