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larry(at)macsmachine.com
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 Posted: Thu Aug 10, 2006 1:35 pm Post subject: Economical Low Pressure Air System |
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Hi guys,
I’ve been painting with Hangar 21 AFS water borne system and was getting
along very confidently with a 3M dual filter organic charcoal
respirator, but I made a mistake that could have gone very wrong. I
turned on the exhaust fans in my booth, but due to interference with am
radio reception, I’d earlier unplugged the fans at the wall. I sprayed
the trim color on my stabilizer, which took no more than about
5-minutes. Over spray build up was such that I was seriously worried
about effectiveness of my respirator. It has limits for heavy
concentrations. I couldn’t smell the paint or fumes, but did feel a bit
dizzy later. That did it! I decided to put an air system in front of my
respirator. After checking what others have done, I made up a hood and
mask system that fits over the 3M Respirator that guarantees fresh air
is the only thing my respirator would have to deal with.
A hood was cut and sewn from a disposable Tyvex paint suit. The legs
were cut off in a radial pattern from the crotch to the armpits and sewn
shut. The zipper was oriented to place the shut-end at back center of my
head. I bought a new face shield and put 1/2-inch Velcro on the outer
edges of the clear shield and across the solid top edge. The Tyvex
“face” was placed tightly against the sticky side of the Velcro and the
Tyvex inside that perimeter was cut out. Integration of the mask and the
hood only took an hour and a half and the cost was well below equivalent
commercial parts. I also purchased a small portable vacuum and ordered
50-foot of air hose. The hood combination face shield fits over the
respirator and inside the neck of my other Tyvex paint suit. An
accessory hose-fitting relieves excess pressure and reduces to a
3/8-inch hose for inflating things. The small hose extends into the hood
and is supported at my belt. I use Saran wrap on the face shield and its
replaced as needed. The apparatus is comfortable, easily maintains
visibility and still allows a good range of motion for spraying in the
booth. Should have done this in the first place.
If you’ve any interest in this, I’ve placed pictures of the
“low-pressure air hood” on my web sites “paint” page. It shows enough
detail for anyone to make one of these. Difficulty rating is about a “3”
and the average material cost would be about $25 (without the vacuum).
See links below.
http://www.macsmachine.com/images/paint/full/hood-front-w-Saran-Wrap.gif
http://www.macsmachine.com/images/paint/full/blue-&-cream-stab.gif
Have a good one and "fly safe"
Larry McFarland – 601HDS at www.macsmachine.com
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dougsire
Joined: 10 Jan 2006
Posts: 37
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| Posted: Fri Aug 11, 2006 6:42 am Post subject: Economical Low Pressure Air System |
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This just proves that you can't watch "Apollo 11" too many times!
Doug Sire
601XL
Do Not Archive
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Doug Sire 601XL
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