Air filtration fan

  • Advertise with us
Project by RobertHorton posted 10-20-2009 08:37 PM 4679 views 10 times favorited 11 comments Add to Favorites Watch

Nothing glamorous here. Some leftover wafer board and an old box fan that the wife won’t notice missing until next summer rolls around.

11 comments so far

View NBeener's profile


4816 posts in 3172 days

#1 posted 10-20-2009 08:53 PM

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.

In other words, though … very nicely done!

-- -- Neil

View ohwoodeye's profile


1986 posts in 3152 days

#2 posted 10-20-2009 09:13 PM

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?

-- Directions are just the Manufacturer's opinion on how something should be assembled. ----Mike, Waukesha, WI

View RobertHorton's profile


18 posts in 3314 days

#3 posted 10-21-2009 02:01 AM

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.

View woodworm's profile


14468 posts in 3589 days

#4 posted 10-21-2009 02:38 AM

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.

View woodworm's profile


14468 posts in 3589 days

#5 posted 10-21-2009 02:39 AM

”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.

View NBeener's profile


4816 posts in 3172 days

#6 posted 10-21-2009 03:02 AM

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

View woodworm's profile


14468 posts in 3589 days

#7 posted 10-21-2009 03:07 AM

Thanks Neil Brooks!

-- masrol, kuala lumpur, MY.

View TopamaxSurvivor's profile


18271 posts in 3674 days

#8 posted 10-21-2009 03:10 AM

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

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View a1Jim's profile


117091 posts in 3575 days

#9 posted 10-25-2009 05:28 AM

Well this came great good job

-- wood crafting & woodworking classes

View bigike's profile


4052 posts in 3287 days

#10 posted 02-10-2010 05:12 PM

nice work, i just put one of these over my saw it works great

-- Ike, Big Daddies Woodshop,

View Brohymn62's profile


125 posts in 2254 days

#11 posted 06-19-2012 03:29 PM


-- Chris G. ; Los Angeles, CA

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics