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Made an air purifier from a box fan, an air filter, and some duct tape. : r/redneckengineering
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H13 HEPA Replacement Filter for U ULTTY Air Purifier Fan, with Medical Coating, Original HEPA Filter Compatible for Purifying Fan Model CR020 / CR021 : Amazon.co.uk: Home & Kitchen
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The Cuboid: A DIY air purifier that's better than a box-fan
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How to Make a Box Fan Air Purifier: 3 Different Methods | Digital Trends