Changed out the Corsi Rosenthal filters at the house... this is not filter material, this is a thick layer of drywall dust. Wore an N95 and removed these outside, it was nasty. 😬 #aqi#airquality#PM2point5
I maintain 2 CR boxes for a friend's bookstore and those filters always look rough when it's time to change them. They were shuffling some books around in their basement and the filters were colored gray not 3 days after I swapped them.
@Geojoek Well, the papers say they last 1000 to 4000 hours "depending on location", but given my house has been a construction zone for 4 months, I think the hours are significantly reduced.
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