Downdraft/sanding table/air purifier

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Project by jwisbey posted 10-18-2011 04:24 PM 7797 views 26 times favorited 5 comments Add to Favorites Watch

This a a downdraft table I made using an old furnace fan blower from a furnace that was replaced in my house. It sat around for 15 years until I decided to put it to use. The fan is wired for 4 speeds so I can control the flow of air in the shop. I used peg board glued to 1/4” plywood for the top and drilled holes for the inflow of air (too many to count). I made it the same height as my existing bench so that I have an expanded work surface for larger pieces.

I use a series of 6 filters (20×20), 3 on each side. Each is progressively finer. This way I can change the cheaper ones more often while maintaining airflow through the table.

I use a anti-slip rug pad when I am sanding and the suction from the inflow holds the piece without the need for clamps, even when using a belt sander. When sanding the table does a good job of eliminating dust in the air. It also filters the air when I am using other machines in the shop. This has greatly reduced the airborn dust in my shop and I wish I had built it earlier.

5 comments so far

View rmoore's profile


325 posts in 3144 days

#1 posted 10-18-2011 06:54 PM

Very smart combining the two. I’ve thought of making both, but not in one unit. Also like that you made the same height as your table saw. I may have to copy this. Thanks for posting!

-- The more I learn, the more I realize I don't know. Ron, Crossville Tn

View MasterSergeant's profile


1421 posts in 3198 days

#2 posted 10-18-2011 08:54 PM

Clever combination. Thanks for the insight, I’ll be building one of these this winter!

-- Kelly, woodworker under construction

View Drew - Rock-n H Woodshop's profile

Drew - Rock-n H Woodshop

646 posts in 3200 days

#3 posted 10-18-2011 10:12 PM

So does the fan motor create a vacuum effect in the box while blowing out filtered air? do you find that the air coming out blows dust on the floor around too much???

-- Drew -- "I cut it twice and it's still too short!"- Rock-n H Woodshop - Moore, OK

View jwisbey's profile


35 posts in 2923 days

#4 posted 10-18-2011 11:01 PM

Yes the fan pulls the air through the top of the cabinet and out the end. If there is a lot of dust on the floor, it will tend to concentrate it in certain areas. Most of the tools I use have dust collection hook ups so I try to keep the dust off the floor.

View TNwoodchuck's profile


102 posts in 4285 days

#5 posted 10-19-2011 01:14 AM

Great ideas! I built a similar unit several years ago, but without the downdraft top. Looks like I’ll be reworking mine using your innovations. Thanks for posting.

-- Chuck near Nashville - “All you are unable to give possesses you” (Andre Gide)

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