On Mon, Jan 28, 2002 at 10:56:46PM -0500, Mark Watson wrote:
>
> ----- Original Message -----
> <snip>
>
> > Another method is to put the air pump on the other end... pumping air
> > out, not in.
> > I have set up a paint booth by enclosing an area in plastic sheet
> > and using a small box fan and some aluminum ducts to pull air out of
> > the booth. Fresh air comes in to replace the air that's pulled out.
> >
> <snip>
> >
> > Eric
> >
> I'd certainly advise AGAINST pulling the air versus pushing it. When you
> pull a vacuum (however slight) you run the risk of drawing nasty stuff in
> with your fresh air supply. With positive pressure however any leaks just
> spew some of your fresh air into the environment.
I wasn't clear.
You apply the (slight) vacuum to the booth. The fresh air vent that
admits air to the booth, instead of running into the booth (or in addition
to doing so), runs into your mask.
This way your mask is at a positive pressure compared to the booth, which
is the goal.
> However, I do agree with
> the other previous post about being careful about other contaminants being
> introduced into the fresh air stream.
Yep. A duct high up (not on the floor), possibly with a filter, would do.
Eric
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