
A homemade Corsi-Rosenthal box air purifier assembled using a Utilitech 20-inch box fan (50 cm) and Tex-Air brand MERV-rated air filters arranged in a cube configuration. The boxes for both the Utilitech fan and Tex-Air Filters (by Allergy Relief Technologies, Inc.) are visible in the background.Open full document
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A homemade Corsi-Rosenthal box air purifier assembled using a Utilitech 20-inch box fan (50 cm) and Tex-Air brand MERV-rated air filters arranged in a cube configuration. The boxes for both the Utilitech fan and Tex-Air Filters (by Allergy Relief Technologies, Inc.) are visible in the background.