There are two ways to make your Corsi/Rosenthal air purifier. The fan can either be pointing up toward the ceiling or sideways, like a normal box fan would.
First, tape the four air filters as shown on the video. Whichever side you plan to lay on the floor (the base), is the side you want to place the cardboard (since there will be no air coming in to get purified). Make sure the arrows on the side of the air filter are pointing inside of the box. Try to leave no space for the air to come in, or you’ll have “unpurified” air coming into the fan.
Second, tape the box to the base and the box fan on the side that is left. Again, make sure no gap is left when taping.
And third, cut out a shroud that will go over the fan to limit only the circular part to blow air out. According to Rosenthal, this will close the gaps at the corners and make the fan blow air out more efficiently, which will make your DIY air purifier work better. Tape it and make sure to leave no gaps.
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