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== CR Boxes == '''Corsi'''-'''Rosenthal Boxes''' ([[CR Boxes]]) are air purifiers that are much more affordable and efficient than commercial HEPA air purifiers. CR Boxes consist of MERV-13 filters and a box fan or a set of PC fans due to their high speeds and low noise. CR Boxes can easily be built at home or they can be purchased from people who have dedicated themselves to building them<sup>[https://www.cleanairkits.com/]</sup>. One of the easiest to build is the [https://itsairborne.com/the-mini-pc-fan-cr-box-975d0b069f4c Mini PC Fan CR Box] by Joey Fox.
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