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Antique Tractor Paint and Bodywork

Re: supplied air resperator

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BobinMi.

11-14-2012 18:34:37
67.142.177.23



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I got mine on Ebay. Bought a 3m battery powered blower that hooks on your belt/ or vest 3m sells. Watched for a SATA bump cap with flip up face shield, between the 2 I spent about 300.00 for a 1000.00 plus unit. It has tube from blower to helmet. Can wear glasses, have beard,and it is not tied to another hose. Go to Ebay and put in PAPR and do some research on wat will work for you. The past posts on this forum are great.

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FarmerZeb

12-12-2012 16:57:42
76.92.148.33



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 Re: supplied air resperator in reply to BobinMi., 11-14-2012 18:34:37  
there is a big difference between a PAPR (Powered Air Purifying Respirator) and a SAR (Supplied Air Respirator. If you are going to spend money you want the SAR a PAPR is nothing more than a cartridge respirator with a pump.

to answer the original question the

Breathecool can be had for around $320
Hobby Air can be had for $400
(for half face models)

either will would work for limited duty as others have said a long hose is required (i recommend a 75' hose)

-paul

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CNKS

11-16-2012 18:58:15
216.144.104.128



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 Re: supplied air resperator in reply to BobinMi., 11-14-2012 18:34:37  
If the intake connects to your belt you are breathing contaminated air. I have seen pictures of those worn by people applying herbicides. It might work more or less there, but I don't see how it can possibly work for isocyanates when you are surrounded by fumes containing iso's, even if it is feeding a charcoal mask. It would be very similar to a hose equipped supplied air unit with the blower/intake in the fumes.

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BobinMi.

11-17-2012 10:33:06
67.142.177.26



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 Re: supplied air resperator in reply to CNKS, 11-16-2012 18:58:15  
The 3M unit has 3 large screw on filters and will work for paint. As 3M supplies manny different types of filters, I emailed a spec. sheet for the paint I am using and the replied as to filter needed. I will admit firters are a little expensive (3 @65.00 ea.) but no hoses.



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CNKS

11-17-2012 12:02:33
216.144.104.128



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 Re: supplied air resperator in reply to BobinMi., 11-17-2012 10:33:06  
But, if you are using hardener, there is no filter that will keep isocyanates out, unless you keep a very rigid replacement schedule. I imagine they need to be changed after every use if they work then -- $$$. I trust nothing but supplied air. Read the fine print that comes with your filters.



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Rod (NH)

11-17-2012 17:17:58
69.131.62.59



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 Re: supplied air resperator in reply to CNKS, 11-17-2012 12:02:33  
I agree.

Just to add to the discussion:

3M does not recommend air filtration at all when the actual air concentration of contaminants is unknown. Filters can be used (per 3M) if 1) the correct ones are selected for isocyanates, 2) the actual concentration is known to be less than 10 times the occupational exposure limit for isocyanates, 3) a documented change schedule is followed and 4) fit testing is performed.

Of course any DIY painting outside of a professional, tested spray booth always involves unknown and highly variable concentrations of contaminants.

My opinion for DIYs - forget filtration for isocyanates. Get a supplied-air system and be done with it. Or stay away from hardeners and urethanes altogether.

Ref: 3M Respirator Selection Guide

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