"Skeleton Man" <invalid@guestwho.com> wrote in message
news:SOidnU9h0aWXHMHVnZ2dnUVZ_r_inZ2d@wightman.ca. ..
> >Air duster cans containing just plain air are available ... but don't buy
>>them: they quickly run out of pressure because the contents is just
>>compressed gas. Some gasses (like R134 and "Freon") liquify at reasonably
>>low pressure, so a can of R134 is mostly liquid that gradually returns
>>to gaseous state as it is allowed to escape. Result: a can of R134 gives
>>much more gas than a same-size can of air (which doesn't liquify at can
>>pressure), and the nozzle pressure remains constant until the last bit of
>>liquid in the can boils off.
>
> Thanks for the info. My concerns about air duster gasses are purely cost -
> all the ones I've seen are tetrafluoroethane (R134a) and cost about
> $10/can!
> I figured maybe there was a cheaper alternative to this.
>
> I was thinking an air compressor would work, but that's likely too much
> pressure and moisture. The main thing I use air dusters for is cleaning
> boards and fans/air intake.
>
> Chris
>
I always use a small air compressor with 18 l air tank, cost only 80$. The
air pressure is adjustable, higher than cans, but low enough to avoid any
problem. And finally, a compressor allows to really clean fans and
radiators, which is not the case with cans.