"RichH" wrote ...
> Vie used self contained breathing apparatus, gizmos, etc. .... all so
> hot inside the face plate that I'd wind up with a half inch of sweat
> sloshing around.

If you have a large enough air supply to maintain a good air flow, the sweat
tends to evaporate... Putting the air supply in the house where the air
conditioner is producing cool dry air helps even more... If you're breathing
cool air, it's not as miserable in a hot poorly vented area...

> Problem with 'fresh air' devices is that they MUST have proper
> vapor/particulate/aerosol filtering applied .... as they can compress
> any stray vapors and pour them directly into your lungs. Think about
> that when a delivery truck with its engine running parks near the intake
> of your 'fresh air' supply.

Not really... If you move your air supply far enough from where you are
working, you're ok... If you can smell the vapors, you haven't issolated the
air supply well enough... With 50 to 100 ft of hose, I can isolate my air
supply and don't need to provide any additional filters...

> BTW when you use a respirator BE SURE to wear airtight goggles so that
> the mist and aerosols dont coalesce on the watery film of your eyeballs
> ... just as serious as breathing in the vapors/mists.

With a positive pressure air supply system, this is not as important since
the air flow prevent any of the vapors from getting into the mask / hood...
My adapted gas mask also goes over the eyes and the grocery sack derived
hood went over the entire head...

> ***** Good idea but needs improvement! ... dont
> forget to ADD a BIG WAD of cellulose/cotton fluff
> etc. ON the intake. The gas mask will remove vapors
> but WILL NOT remove mists and aerosols!!!!!!!!!!!!!!

It doesn't need to since the air source is far enough away that I'm not
getting the vapors in my air supply... Basically, if I can smell the vapors,
something is wrong and needs to be corrected...