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As you can see by pictures of my shop, I was in serious need of dust abatement strategies. Being a student, I was not going to shell out big money for an air cleaner - so I made my own. I also needed an outfeed table, so I decided to kill two birds with on stone. Unfortunately, I have not had the chance to put on the outfeed table mechanism.

The angled bit at one side is there so the contraption can butt-up close to the table saw. The multi-speed squirrel cage came from my friendly neighborhood furnace repair shop for $20 and a coffee. The control is a heavy duty industrial fan control capable of handling the amperage of the motor. The furnace motor has five speed settings, I chose the highest and wired the fan switch to it. By turning the knob, I can adjust the airflow through the filters to suit my needs. The fan control is an awesome investment. When I just need to move air, I set it on low; when I need to scrub dust off the air, I put it on high. The exhaust is strong enough to push my shop vac across the room. I chuckled when that happened.

The two larger holes are sized to fit 16×25 filters. My plan is to fit 2 filters per side: one lower quality filter to act as a prefilter for a more expensive, high quality, Merv 11+ filter. The squirrel cage furnace filters are designed to work with back-pressure from ventilation ducts. Without this back-pressure, the fan cycles too high and starts to stutter - not cool if you are not expecting it. After chatting with my furnace guy, and after getting him another coffee, he informed me of the back-pressure issue. I needed to figure a way to simulate this, so I added a blast gate to the exhaust opening. I turned on the machine and lifted and lowered the gate until I found the sweet-spot. Now this puppy hums at a happy, quiet pace.

The outfeed table was going to be height adjustable so that I could slide it under my saw when I need space. I will post pics when this happens.

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1,833 Posts
Great info on the back pressure. Thx… I just recieved a blower out of a furnance and will be building one soon so this will help. Thx again
 

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I have a furnace blower that I planned on using for a dust filter. Seeing your design will help mine come together faster.Thanks for posting it! I also have one that I hope to hook to some of my saws and routers.
 

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They work great. I just built one the holidays,
and I'm glad that I have it as an addition to my shop.
I know it keeps your shop more dust-free than without it.
Good job, you'll be glad when its running…
 
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