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Build an Affordable Air Purifier With a Box Fan and Hepa Filter - Make:
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Cleanroom Fan Filter Units
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H14 FFU HEPA Filter Fan Motorized Cleanroom Fan Filter Unit - China Fan Filter Unit, HEPA Clean Filter | Made-in-China.com
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The Cuboid: A DIY air purifier that's better than a box-fan
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Technical Bulletin - Retrofitting HEPA Filters to Fan Coil Units - Airclean
