Build a Do-It-Yourself Air Purifier for About $40
Michigan Medicine · 5 HN recommendations
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A University of Michigan Medicine demonstration of building a cheap DIY air purifier from a box fan and a HEPA or high-MERV filter using hardware-store parts. It explains why this helps against dust, smoke and viruses and ties it to local air quality readings.
Why HN recommends it: HN people link it during wildfire smoke and air quality threads as a practical, cheap fix, though a few doubt how rigorously its effectiveness was shown.
“Here's a video from the University of Michigan showing just how effective these cheap DIY air filters can be” Read on HN ↗