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!

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

My DIY Air Purifier Step-by-step build video: [ Ссылка ]
Want personalized guidance on improving your indoor air quality? Schedule a chat with me here: [ Ссылка ]

Clean Air Kits website:
[ Ссылка ]

If Clean Air Kits isn't right for you but you still want a PC fan air purifier, you could also buy the Tempest from Nukit, and for those in Canada, there's North Box Systems. Or you could 3D print your own with Don Plumb's free models: [ Ссылка ]

Scientific research:
Ratliff et al: [ Ссылка ]
Myers et al: [ Ссылка ]
Dal Porto et al: [ Ссылка ]
Srikrishna et al: [ Ссылка ]
Holder et al: [ Ссылка ]
Review of numerous papers: [ Ссылка ]
Azimi et al: [ Ссылка ]
Stephens et al: [ Ссылка ]
Chang et al: [ Ссылка ]
Pawel Misztal's presentation (the figures about PM and mortality rate): [ Ссылка ]

EPA article: research on DIY Air Cleaners to Reduce Wildfire Smoke Indoors: [ Ссылка ]

Simple way to size an air cleaner (AHAM’s 2/3 rule): [ Ссылка ]

Air cleaner selection tool: [ Ссылка ]

Joey Fox’s amazing articles:
Is HEPA necessary for portable/in room air cleaners? [ Ссылка ]
CADR is all that matters: [ Ссылка ]
Are extra features in air cleaners necessary? [ Ссылка ]

David Elfstrom’s article on how to do your own CADR test: [ Ссылка ]

DONATE TO MY CHANNEL: [ Ссылка ]

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