Downdraft Table

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Project by FestusHaagen posted 07-21-2020 05:31 AM 652 views 2 times favorited 7 comments Add to Favorites Watch

This is more of a shop tool than a project, but it did require some woodworking. If sawdust is a problem you might consider this project. I have made several air filter systems out of furnace fans. Before they stopped salvaging at the local landfill I would go salvage the blowers and motors from discarded furnaces. The fan and motors were usually in fine shape. If you know some HVAC companies you could have them save a few for you. I built a box 20X25 to fit a furnace filter. I put it on rollers so it could move around the shop. Cut a hole in one side near the bottom and mount the blower to exhaust there. Mount the motor and attach a v belt. At the top I stack 5 or 6 furnace filters. Then build to lattice out of 1” and 2” strips. Put a frame around that so it overlaps the top of your box. I put several layer of that carpet pad, with all the holes as protection for the project I am sanding. The little holes allow the sawdust to go through and be filtered out by the furnace filters. Hook up a switch and outlets and mount it on the side of the box where it is easy to reach. You now have a downdraft table for less than $30 in materials. You can also build something like this to hang from the ceiling to clear dust from the air.

-- Ed Haagen, Moscow, Idaho

7 comments so far

View Redoak49's profile


4925 posts in 2875 days

#1 posted 07-21-2020 01:09 PM

Very nice and the wood lattice too is great.

What is the MERV rating of your filters. It seems like stacking five filters would create a huge loss of flow due to static pressure . I would use a MERV 13 or 14 to get the fine dust.

View Sark's profile


341 posts in 1247 days

#2 posted 07-21-2020 02:50 PM

Yes, quite a nice project. Don’t think I have room for it in my shop…but I do a lot of hand sanding, so maybe

View FestusHaagen's profile


108 posts in 107 days

#3 posted 07-21-2020 03:18 PM

I don’t know the MERV rating of my filters but they are made for a normal household furnace. I don’t have any dust leave the table and nothing goes through the system. Airflow is enough to hold a board down on the table. I have to clean the filters about once a month when I am making a lot of sawdust.

-- Ed Haagen, Moscow, Idaho

View dmo0430's profile


73 posts in 1889 days

#4 posted 07-21-2020 05:59 PM

I built an air cleaner with a similar system. I put it on a regular on switch and a timed switch so I can leave it on. I was wondering if anyone has done something similar to your design. Glad I found something because it will be a useful addition to the shop. Thanks for posting!

View Brandon's profile


4380 posts in 3838 days

#5 posted 07-21-2020 06:32 PM

Very cool, Ed. That oak top is just too nice for a workshop tool ;-)

-- "hold fast to that which is good"

View crowie's profile


3981 posts in 2838 days

#6 posted 07-21-2020 10:32 PM

Yes Ed, It’s so important to vent wood dust and the secret is the more airflow the better. Top job sir.

-- Lifes good, Enjoy each new day...... Cheers from "On Top DownUnder" Crowie

View Eric's profile (online now)


581 posts in 760 days

#7 posted 07-22-2020 01:59 AM

Great idea Ed, and I like the cost. Never thought about outlets on the side, but it make sense. Thanks for sharing.

-- Eric, building the dream

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