[AT] respirators and Isocyanates (Urethane paint)

[Indiana Robinson]

Hi John:

	Personally I think this discussion took a wrong turn somewhere and is 
now caught in a "compressor rut"... Why would you want to move breathing 
air with a compressor? This is painting not SCUBA diving. Would you move 
air in your furnace with a compressor? You don't need pressure, you do 
need a little volume. You certainly don't need compressor noise in your 
ears.
	I have looked at this stuff for some time for painting and wood lathe 
use both. You want to use the KISS system on this stuff or have a lot of 
$$$$. I have a small 140 CFM squirrel cage blower (about like this)
http://www.grainger.com/Grainger/items/2C915
  that I want to use to pull air from completely outside of the area 
where fumes or dust are and maybe have its inlet fed by a hose who's end 
is "well" out of the area. The inlet hose could be simply cheap black 
polyethylene corrugated drain tile (the unslotted kind), 3" or 4" inch 
either one should work. Put some kind of screen on the intake, you don't 
want a freshly blown yellow jacket in your helmet with you...
:-)
Go buy a yard-sale motorcycle helmet with a front shield and drill a 
mounting hole for the feed hose in the back so that the air will be 
pushed up over the top and sides of your head and will of course exit 
mostly out the lower front. The feed from the blower to the helmet could 
be light weight common plastic vacuum cleaner hose. You can buy it as 
replacement hose for central vacs in longer lengths. Don't buy the heavy 
stuff, the really light stuff will work fine and be much easier to manage.
	The part that requires being a little creative is the attachment of the 
hose to the helmet. You don't want it sticking straight out the back and 
pulling on you while you work.
	Pick a helmet that has a front lens that you can walk in about anywhere 
and buy off of the shelf. You will need to replace it now and then. 
Don't buy the helmet too small you want a little room and you probably 
won't crash while painting anyway...
:-)
	That is my version of a low cost system...



-- 


"farmer"


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Francis Robinson
Central Indiana, USA
robinson at svs.net