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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Shop-Built Down-Draft Table Ideas 
Question
Forum Responses
From contributor B: I bought a salvaged squirrel cage fan from a Coleman furnace (mobile home type) from a local HVAC company. It is a three speed and moves a lot of air. I built a frameless base cab on casters, mounted the fan blowing out the front, and closed off the rest of the front. I screwed cleats, 1" square to set the filter on, and sized cab to fit filters. I used 20 x 25. The lowest was a small micron job with a cheaper one on top then a grid of 1/4” hardboard above that. It took two hours or less to build. I run mine all the time as a cooling fan and ambient air cleaner. From contributor C: I have used a number of shop-made sanding tables, but I've never actually built one. I seem to recall they were just tied into the shop dust collection system with an upside down hood. Instead of holes in the table, one place had a latticework top with the tops of the upper rails padded with carpet to prevent scratching. Your idea, although imaginative, may not work. You'd have to have a fan underneath, blowing up, to overcome the natural effect of gravity. Then, your hood would have to pull a ferocious vacuum or the dust would be all over the shop. From the original questioner: Rockler offers a kit for this. I strongly prefer to build mine with a Leeson or Baldor motor. I suspect they use an impeller, like on a dust collection system. I have also seen the squirrel cage used. From contributor E: I’m a woodshop teacher in a high school and I had students build one in our shop and it works great. The link below takes you to the plans that we used and modified to meet our needs. It sounds a lot like what contributor B described. Just get in touch with a local HVAC shop and you can probably get a used blower pretty cheap. Related Web Site: Downdraft Sanding Table From contributor F: I do not understand your statement about buying with after tax dollars - plus the 25% taxes. I buy tools with before tax dollars, write them off and save on average 1/3 of the intial cost on income taxes. That makes my $1495 plus $110 shipping, table cost about $1100 after taxes. From the original questioner: To contributor F: Perhaps I am wrong or perhaps part wrong. You save by writing it off but you are still paying for the item with after tax dollars. The $1605 didn't make it in your pocket free and clear. From contributor G: I built one similar to the one contributor E mentioned, using a free blower from HVAC friend. The only modification I eventually made was to take out the filters and have the blower output going to a shuttered vent from Grainger. Now the stuff simply blows outside, with no cleaning of filters. Have you reviewed the related Knowledge Base areas below? 
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