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Need a cheap but effective air purifier for around USD 45.00? Check this link out. https://www.texairfilters.com/how-to-improve-the-efficiency-of-the-box-fan-and-merv-13-filter-air-cleaner/
Need a cheap but effective air purifier for around USD 45.00? Check this link out. https://www.texairfilters.com/how-to-improve-the-efficiency-of-the-box-fan-and-merv-13-filter-air-cleaner/
@tw33k
Yes.
This is important!
In the original "Corsi-Rosenthal Box" video, they stress this.