Photo of the Week: Corsi-Rosenthal Air Purifier

A white plastic box fan sits on top of a box cube created with four 20x20x2 inch furnace air filters held together with blue duct tape and a brown cardboard square for the base. Three corners of the box fan are covered with cardboard triangles tape to the fan to cover air spaces and create a more airtight box. The box sits on light brown carpet.

About a week ago, when I read wildfire smoke would soon sweep through Michigan, I went to our basement and brought up a box I hadn’t used in a while.

In summer 2023, when wildfire smoke moved through our southeast Michigan area, I built our own air purifier from a box fan, furnace filters, cardboard, and duct tape.

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