Air filtration fan

a) No way to get a few more clamps on that thing, huh? ;-)

b) having just bought the $18 box fan, and bungee’d a 3M Filtrete on it … it really DOES seem to do a fair job. My eyes are out, however, for a used attic fan … to try to get something like this put together … but ceiling-mountable.

http://www.woodbin.com/misc/air_filter.htm

In other words, though … very nicely done!

-- -- Neil

Does the dust blow through the fan onto the filters or does the fan blow out sucking the dust onto the filters before it ever reaches the fan. I am assuming the second case but then isn’t there a stream of air from the fan blowing through your workshop which might stir up settled dust?

-- Mike, Waukesha, WI

Neil – I guess a few more wouldn’t have hurt. I was gluing a long, thin stop around the inside and wafer board is bendy stuff. Either get a really deep caul or find a use for all those old c-clamps that never get used. No, a box fan doesn’t have as much oomph as an attic fan or (better still) a furnace fan. If you can get one of those for your project you’ll be much better off. Thanks for the compliment.

Mike – Both. The fan is oriented straight down and the upper face is also a filter. So the air gets pulled through a cheap filter and then through one of the expensive 3M filters. I suppose the downdraft will stir up a little dust, but one hopes that any dust light enough to be so disturbed will eventually find its way back into the machine and get caught in the filter.

Great low cost project indeed (unless your wife requests a reinstatement…LOL)
If I use exhaust fan instead, where shall I put the fine filter?
Thank you for sharing!

-- masrol, kuala lumpur, MY.

”If I use exhaust fan instead, where shall I put the fine filter?”
Is the fine filter is supposed to be at the “inhale” or “outhale” of this box?

-- masrol, kuala lumpur, MY.

On mine, it’s on the inhale side.

I’m pretty sure that’s how it works on furnaces, too. I know it does on mine: downstream (before the furnace, but after the fresh air intake) is the HEPA filter, then a “Skuttle” media filter, and then the 3M Filtrete furnace filter.

In my shop, the current cheapo is simply pointing “out of” the shop and into the other room, hopefully not stirring up dust.

Tougher to do in a ceiling mount unless you use the down side to intake and then use the sides of the box to exhaust.

-- -- Neil

Thanks Neil Brooks!

-- masrol, kuala lumpur, MY.

All furnaces and other heating ventilation and Ac equipment have the filter on the intake side. some add a final filter on teh discharge .

-- Debt is nothing more than the 21st Century's form of slavery.

Well this came great good job

-- Jim from Heirloom Woodshop Southern Oregon