I need a downdraft table. I was think of making one around this Holmes
Air Filter I picked up at a garage sale. It is one of the big round
ones (retails for 200-300 dollars). Im a newb so Im not sure if it
will have enough power or what-all. Has anyone else done this? It
seems like a good idea as I got it in almost new condition for twenty
bucks! It has a prefilter that wraps around the HEPA filter. I have
actually used it by turning it on its side and sanding over it on my
knees. You have to be pretty close for it to suck all the dust right
We bought one years ago but never used it because the noise/effectiveness
ratio was just too high; one of the poorer purchases I have made. (well,
besides Amazon at $150; just kidding, I didn't do that)
I am now using it in my shop but intend on replacing it with a real air
filter as soon as I can live with the expense.
The thing is way too feeble to power a downdraft table, or anything else.
$20 was a fair price only if the filter has some life in it.
The short answer is: No, it won't work for what you're trying to do.
You need far more than a typical living-room HEPA filter can provide.
Those units are for typical living space use, not for woodshops.
Even if they worked, the filter would plug up in almost no time at all.
You need a real dust collector that pulls at least 800 CFM (cubic
feet per minute), 1200 or more is even better, and I'm not talking
about the CFM numbers you see on popular dust colectors marketed by
some importers where they don't give you any idea about how they
determined their "specifications". I'm talking about 1000 CFM or more
***AT*** not less than 7 inches of static pressure.
I suggest you spend some time on Bill Pentz's web site and get well
acquainted with the ins and outs of woodshop dust collection so you'll
be well informed and able to pick apart the nonsense specs some outfits
put on their products. Bill has done more research on the subject
of dust collection in small woodshops than about anyone on planet
Earth. He has even designed a cylone system and kits are available
-- details on the site.
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