Photo 1. My solution to cheap clean air in the shop.
Photo 2. Just a box and an exhaust fan with a big hole in the bottom.
Photo 3. I used metal-clad wire because of all my shop wiring is exposed.
Photo 4a. The box is mounted between the trusses.
Photo 4b. I wrapped insulation around the box for good measure.
I installed mine between the trusses in the attic, (Photos 4a and 4b) only the filters and vent deflectors protrude into the room (Photo 5). If you don’t have an attic, (or your mate won’t let you cut a hole up into the kitchen floor), just mount the box on the ceiling.
Photo 6a. The box measures 31". x 22". x 12".
Photo 6b. Close up of fan and shroud mounted in the box. I did have to bend the shroud base up on all sides to fit. The sheet metal cuts and bends easily.
Photo 7. I used two 1" furnace filters. When the bottom one gets clogged, I replace it and put the new one on top.
Photo 8. Notice the low profile in the shop.
Photos By Author
Jake is a registered member of WWGOA. See more of Jake’s woodwork at his website, Saw Dust by Jake.
Submit your favorite woodworking tip or technique to editor@wwgoa.com and you could earn $100 if we publish your idea.
16ftx24ft woodworking shop
does it vent right into the attic or outside?
Hello. This setup vents into the attic.
Thanks
Paul-WWGOA
Your design looks as if the air from the work space is being sent outside and not back into the work space. In this case, the filters don’t provide any value to what you are breathing inside. In hot/cold climates, the cool/warm area is being sent outside increasing your cooling/heating bill. Also although the fan maybe rated at 1000 cfm, your design reduces this number, because of how close the top of the hood is to the fan and then has to may a 90 degree turn. In other words, the area flow is being pressed against the hood, stops and then moves towards the exit. My guess is that the design probably is working at 50 – 75% efficiency.
Hell of an Idea brother !! I Like it !! May have to “Copy” that…… Thanks dude !
Do you sell the airfiltratiom system plan .
Hi, John. Everything that we have on this topic is included in the article.
Looks good!. If you know a heating contractor, you might see if they have any old furnace blower assemblies they want to get rid of. They would be free (cutting your costs) and, if serviced regularly, would provide years of service. Also use Pleated filters rather than the cheap disposable ones. They are more expensive but will capture more dust too! Especially if you’re recycling your air.
To what particle size are you filtering? 10 microns, 5 microns? To what particle size is enough? Thx, and I love the low profile aspect..
We did not perform a scientific study on this to determine the actual particle size that was captured, but because the exhaust in this case is blown into an uninhabited attic, the author was not as concerned with capturing the finest particles. If you are recirculating the air back into the shop or another inhabited space, it is more important. Ideally you would capture down to 1 micron or less in that case
You apparently did not understand the design. The air is not exhausted into the attic, but is recirculated into the shop space. The box is closed on the top and air is sucked in through the filters and exhausted through ports on the ends of the box.