My common sense analysis of commercial booths concludes that best is a
(filtered) output fan and filtered input with enough square area to maintain
a low velocity, eg. a filtered screen door at least, and the rest of the
room sealed against leaks. Fan velocity would need to be just enough to
ventilate (not gale force).
Barring that, a filtered input fan pointed away from the work and filtered
open window or two could work in a leaky garage, with the volume of the
leaks not being enough to worry about painting your neighbor's house.
The furnace filters sound excellent.
Gary Lin Burke, VA National Capital Ch. BMWCCA
Metro Washington Council of Sports Car Clubs
'88 325is <CSP> '89 Accord <HS>
> Nils O. Ny wrote:
> > I have never seen a paint booth with a fan pushing air in.
> > This would be the wrong way to do it for many reasons.
>
> Trevor Boicey replied:
> It could indeed be the wrong direction, but in the past
> a friend of mine tried the fan pointing out and had
> a serious problem.
> The problem was that the air comes back in through leaks
> and pinholes in the garage wall. Since the leaks are very
> small, the velocity of the air coming in is very high.
> It worked out that he had dust line streamers coming in
> wherever there was a hole.
> If I used an old furnace fan with a few furnace filters blowing
> air out, could I expect to get all the paint out of
> the exhaust air?
> I worry about painting all my neighbourhood blue. (including
> my own house and other cars!)
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