Every household should make one of these boxes. No special skills required and parts are inexpensive and readily available.
Reposted from Richard Corsi
Nice article on friend & CR Foundation co-founder Jim Rosenthal. I am so proud of Jim for his altruism and kindness, and for efforts of the CR Foundation Board of Directors to provide healthier indoor air for schools in underserved communities. 💙

thepeak.coloradocollege.edu/2025/04/22/j...

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