to anyone in the areas impacted by the wildfire smoke, my #1 biggest piece of advice as someone whos been dealing with wildfire smoke in the NW united states for years, is build yourself a Corsi-Rosenthal Cube
they perform as well as expensive HEPA air cleaners, and are comparatively VERY inexpensive. all you need is a box fan, 4 air filters, a piece of cardboard, and some duct tape!!!!
i think it took us maybe a half hour to put ours together, if that, and we replace the filters every 3 months. it's really made a HUGE difference, both when the air quality is bad, but also with our allergies
Saw these easy to read instructions on Twitter. Stay safe đ
Great time to start pricing this out by the way, fire season starts⊠on the summer solstice this year, thatâs fun. Signs point to it being a doozy.
[Image IDs: Image #1: a Corsi-Rosenthal Cube; 4 air filters taped together with a box fan on top.
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
Duct tape the four edges
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 MladenoviÄ. Creator: Shiven Taneja. /End IDs]


















