DIY Air Filter


I’ve only recently started working with bigger power tools, and so until now cleanup has involved an old wallpaper brush and a dustpan for the most part. Airborne dust hasn’t really been an issue.

While I’m careful to wear proper safety gear when working with them, I don’t like to keep it on when I’m doing other things. I might leave the glasses on but I’ve not had issues with plane shavings filling my lungs so take off the dust mask then.

I’ve recently been in a workshop that had a couple of big air filtration systems and they seem to work very well at keeping fine particles out of the way. They are pricey and the footprint too big for a small, single car workshop so not an option for me. I do however like the idea so have been thinking of a way to build a smaller one myself.

The answer came to me when sitting at the PC. It has a number of front mounted fans with dust filters on them to draw cool air in while stopping dust. They are forever needing a clean because of the fine dust they pick up. I looked at them today and thought “Isn’t that pretty much what the big air filtration units do?”.

I’ve started to explore the idea further. To make it work I thought, I’m going to need a fan drawing in air behind some sort of filter so that the dust catches on the filter and can be removed. What have I got that can be used?. A little desk fan?. Probably not, not enough power and I can’t really mount it to draw air into a box rather than out without mounting the motor sticking out. Then it came to me – why not use what I already know works and built it out of PC parts?.

As luck (and an inability to throw out anything out) would have it, I have a spare old PC power supply, a 120mm fan and an air filter spare, along with a piece of plywood to build a case. There’s a power switch on the supply unit but this isn’t enough to make it work, you normally have it wired to a power switch on the PC case. In my box of parts though I happened to have a switchback connector, used when you want to test if a power supply is working. It simulates the closed circuit of a motherboard with power switch on and lets you then control the power supply with the onboard switch.

Will it work? Well the concept seems to work on my PC fans. How reliable the solution will be if it does work as expected is also yet to be seen, as these parts aren’t built to handle the fine wood dust but I might have a go at a larger unit with better dust exclusion if this one works. Pictures as usual once it’s done, but it’s down on the backlog below the workbench build and about five hundred other things!.

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