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Type of Fan

    The Corsi/Rosenthal Box is based on a 20″ x 20″ box fan.  This is because the size perfectly matches with 20″x20″ filters.

    Some countries have no box fans. Round fans have been used to build the Corsi/Rosenthal Box.

    • 20″ Box Fan – very important that the On button/ Speed Control is on the outer edges of the fan – or on the front where air comes out.  You do not want it on the back where air comes in. 
      • Lasko 20″ Box 3-Speed Fan
      • Utilitech 20-in 3-Speed Indoor Box  Fan  – these  also  come  in  black.

    Safety note: the box fans have been tested and found to more than up to the task.  With that said, as an additional note, it might be good to get one with a fused plug, which the Lasko and Utilitech fans have for sure.

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