There was a tip a few years back in FWW where someone took a box fan, and attached a furnace filter to it with some wood blocks to hold it in place. The beauty of the design, once built, was that it was super easy to switch out a dirty filter….
I remembered this old tip, and snagged a 20” x 20” box fan last weekend when i went out to pick up a new dehumidifier. The old one nearly started a fire when I plugged it in. Flames were literally arcing between the plug and the extension cord, one of the prongs half burned off!
Heading over to find the filters – many options to choose from as far as filtration goes – and all conveniently 20 inches square!
I figured I’d just use duct tape to secure the filter to the back side of the fan – so it could pull the air away from where I was working, the force of the fan pulled the filter in place – magic has kept it there, no affixing necessary (the floor must slope away ever so slightly, and gravity is really doing the job.
Does it work:
Is this a replacement for proper air filtration and safety gear? No. But I have noticed a huge difference in my comfort level. (Temperature, visability, breatheability) I could also finish my Thorsen Table – sanding wood and stone alike – without tripping the smoke detector!