I have an old box fan, central air conditioning filters, and some MDF lying
around. I can make my own air filter!
Is this a bad idea for some reason? It seems like $150-500 is a lot to spend
for one since I'm only a weekend warrior. I know its my health, but...!
Several years ago one of the magazines had the plans for a squirrel cage
filter and an outfeed table combo. I built it and it has worked really
well for me. The top of the box you build for the blower and filter,
etc, acts as an outfeed table for my tablesaw. The base is on casters.
It's a good idea. A better one is use the fan elsewhere, go down to your local
HVAC store and ask them if you can scrounge a squrril cage fan out of an old
furnance they are throwing away. Build a box around that with your MDF with
the filters on the intake end (get some pleated furnance filters) and you will
havea far better unit than a box fan with AC filters.
|I have an old squirrel cage fan and have been planning on making exactly
|what you describe. A couple of furnace filters on the intake should do the
Exactly what I did. I use a pair of stacked filters, a cheapie as a
"prefilter" that I change often, and a better pleated one getting rid
of the smaller stuff. It's not HEPA but better than nothing and a lot
less expensive than the $50 ones for the commercial boxes.
I've done it. Make the first filter a normal furnace filter and back it
up with one of the "allergy" filters. Back when I was a smoker, that
combination would even remove the smoke and the smell from my 12'x14'
shop in 5 or 10 minutes.
Woodsmith magazine had a shop filter project in an issue from the mid '90s.
Basically it is a plywood box containing a squirrel cage fan with two
furnace filers at the front and a single furnace filter at the other end.
It's made to hang from the ceiling. It works quite well.
I built an air cleaner before. My comments from that experience are:
- If you need to buy a new squrril cage fan to construct an air
cleaner, you probably better off buying an air cleaner instead of
building it because the new squrril cage fan will eat up all the money
saving from building an air cleaner. Therefore, this is important to
get a free or very low cost squrril cage fan instead of buying it.
Otherwise, this project won't make any economic sense.
- If you want to cut down the noise coming from the air cleaner, you
may want to use heavy and bulky material to construct the air cleaner,
such as MDF. This will make the air cleaner very heavy. And you may
not want to hang that heavy object over your head. This means you may
need to put it on bench top or on the floor.
- If you are going to put it on bench top or on the floor, you may
find that it will take up your valuable shop space. This is especially
a problem if the workshop is small. In this case, you may want to
convert it into a multiple-functions unit instead of just doing air
cleaning in order to get the most use of the same space. You may make
it into a sanding table, or a stand for other tool, or an outfeed
table as suggested by another newsgroup member. I didn't make mine to
be multiple-functions, and now I regret :(
Hope your project a success.
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