The tune is based, with permission, on “How To Build A Fence” by Nova Scotia singer/songwriter Bob Snider.
How To Build A Corsi-Rosenthal Box
It’s time to clear the air Cause COVID is still there… And if you want a cheap machine that will cancel tox- -ic pathogens in the air, Well then you oughta hear ‘bout the Corsi-Rosenthal Box.
First you get your fan, Keep the box that it came in You’ll need it for the floor; Now get filters, count 'em, four. What rating? MERV-13. The hardware store will know what you mean. As always, you’ll be stuck, Without your tape for duck. Now add a box-cutter, you're on your way to warding off the pox! This is everything you need to build a Corsi-Rosenthal Box.
With the filters, build the shell In order to build it well Look for the big arrow; It shows how the air should flow. First filter you begin With the arrow pointing in Then build a filter fence By butting up against Tape it up so every filter interlocks Now you’ve got four strong walls for your Corsi-Rosenthal Box.
Don’t worry there’s not much more But you’ve got to make a floor That shouldn’t come as a shock Since that’s why you kept the box So cut your square to fit Tape it on the top of it Turn it upside down and then You’re ready for the fan Now with all you’ve done you’ll find that you’re approx- -imately one or two steps from done your Corsi-Rosenthal box
Before you do the rest, You’ve got to give the fan a test You'll feel like such a jerk, If it turns out not to work, When you’ve used up all that tape To attach it to the crate And covered gaps and slits With tape and cardboard bits
Not to complicate, just make a little slit in the tape So the cord can escape Or else the thing will never go Make a little slit then cut another bit Also with a slit They fit Opposite And overlap them now you’re sealing soundly so– You’re sure it’s only through the filters air can blow– Also— They take out dust and pollen and smoke Which is good to know Tape the corners of the fan just to increase the rate of flow– Oh! Congratulations you just built one of the building blocks, For being safe to respire (Ahhh…) Now sit back and admire Your lovely little Corsi-Rosenthal Box
