We've done extensive research into the tools to help you prepare for the next wildfire, but if the air is full of smoke right now, and you're missing a few items on that list (such as an air purifier), this temporary fix may help mitigate the conditions in the meantime.
In 2018, I tested a popular claim: that sticking a furnace/HVAC filter on a standard box fan produces a useful DIY air purifier. I taped a 20-by-20-inch Honeywell FPR 9 filter to a Lasko 20-inch box fan and ran that combo through our standard 35-minute, five-match test in our 200-square-foot New York test space, with the fan on high. And you know what? It did okay, cutting the initial particulate load by 87% over 35 minutes on medium. That’s nothing like the 99% reductions our purifier picks achieved on their high settings, but the results were better than one might expect.
from Wirecutter: Reviews for the Real World https://www.nytimes.com/wirecutter/blog/how-to-diy-an-air-purifier/?utm_source=rss&utm_medium=feed&utm_campaign=RSS%20Feed
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