Image #1: Map of the Great Lakes region of the United States showing wildfire smoke intensity. There is a wide swath going from New England across the Minnesota.
Image #2: Illustrated guide titled: How To Build A Corsi-Rosenthal Box. Body text reads: The Corsi-Rosenthal Box is an affordable DIY air-cleaning system made with simple materials found in hardware stores. The box fan pulls air through the filters on the sides and blows out clean air. It is proven to reduce indoor exposure to airborne particles including those containing the virus that causes Covid-19. The box can also decrease the levels of other particles in the air, such as dust or wildfire smoke.
Illustration by Amanda Hu: Unassembled Corsi-Rosentheal Box, arrow pointing to assembled box. Text:
Filters can last up to a year
Keep away from walls and corners
The Materials. Illustration: 2 air filters, a box fan, scissors, a utility knife, tape. Text:
Filters 3M 1900 MPR (20" x 20" x 1" or 20" x 25" x 1") or MERV 13 (20" x 20" x 2" or 20" x 20" x 1" or 20" x 25" x 2" or 20" x 25" x 1" [2-inch preferred)
Lasko or Mainstays 20-inch Box Fan
Scissors, Utility Knife, Duct Tape
The Cube. Illustration: 4 filters arranged to form a cube; hands taping the edges of 2 filters together at a right angle; 4 filters taped together to make a cube. Text:
Arrange the filters to create a symmetrical structure
Ensure the arrows are pointed inwards
Vertical orientation of the pleats is preferred
Illustration: An air filter, with arrows on the outside edge corners. One corner, with the arrow, is circled in and enlarged.
The Base. Illustration: A cardboard square on top of the cube made of air filters; hands taping the cardboard square onto the cube; the cardboard square taped to the cube on all 4 sides. Text:
Use one side of the fan's cardboard box
Cut the cardboard box to fit the base of the cube
Duct tape it on all fours sides
The Fan. Illustration: A box fan on top of the cube made of air filters; hands taping the box fan to the cube; the fan taped to the cube, with an enlarged circle on a corner showing the tape leaves no gaps. Text:
Place the fan on top of the cube
Seal all sides, including corners
Ensure any holes on the side of the fan are sealed off with duct tape
The Shroud. Illustration: A cardboard square with a large circle cut in the middle of it; that cardboard square on top of the box fan; hands taping the cardboard square to the top of the fan which is on top of the cube made of air filters. Text:
Cut the other cardboard sheet to fit the top of the fan
Cut a circular hole (15.75" diameter)
Place the shroud on the fan and tape it on all four sides
The shroud increases efficiency and decreases the noise level
Illustrator: Marija Mladenović. Creator: Shiven Taneja. /End ID]
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