Rank: New forum user 
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Hi All - Does anyone have specific knowledge of fume/filter 'interactions'? We have just kitted out a specific room primarily for welding activities. It is very bare-bones and is a hot work permit dream. It contains a major LEV hood in the roofspace. The only rub is that the same room was used for general painting activities and Engineers want to carry on with this. Paints can be permanently removed and fire risks adequately handled, but someone's asked about the filters getting clogged up by the paint fume and how this might affect welding fume. I don't have much experience of this. I presume this must happen in garage workshops and the like.
I don't have much experience on the paint side. Obviously housekeeping and storage will be key, I am just specifically interested in the 'fume science'! Thanks
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Rank: Super forum user
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Not a good set up.
I suggest individual hoods/ducting for each welder.
Also do you know what type of paint? If it’s isocyanate/urethane then there’s another big problem…..
John
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Rank: Super forum user
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Not just isocyanates. Many water-based paints contain isothiazolinones which are potent skin sensitisers, even at very low concentrations. I have several studies on these that show that water-based paints can release these into the atmosphere for several days even after the paint has dried with resultant allergic skin reactions for those already sensitised from exposure to these in many other products.
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 1 user thanked chris.packham for this useful post.
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Rank: Forum user 
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Gents
There is a couple of major issues I see with your setup as described but not actually having seen it I may be jumping to conclusions. Firstly you didnt say if the paint is solvent based or water based. Second you didnt say if how you are applying the paint e.g. a roller or brush application will usually only allow fumes and vapours to be drawen into the system which wont clog the filter whereas spraying paint will potentially clog the filter. Additionally you mentioned the canopy as a fixed LEV Hood in the roofspace that suggests paint fumes and welding fumes will be drawn up over the face of the operator for extraction. This suggests that it is drawing the fumes and vapours into their breathing zone of the operator prior to capture as opposed to pulling the fumes and vapours away from the operators face and breating zone to be captured.
Is he paint substance flammable and have you considered the internals of the ducting in regard to the motor impellor as non sparking design and any ATEX or DSEAR implications.
This is just a few simple problems I can forsee and I have to many to mention in such a small space with so little information.
Your LEV Statutory inspector should hopefully be able to guide you.
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1 user thanked John Elder for this useful post.
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Rank: New forum user
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Thanks all - I never actually realised this post had replies as i didn't seem to get any notifications... I'll do a bit more digging on the paint types, though this booth has been out of action for a while
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Rank: Super forum user
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Hi Edward May be your notifications ended up in your Spam folder. Perhaps given that this site is marked as "Not secure" almost anything that comes into my inbox as a result of these Forums upsets my Norton anti-virus and is dumped into the Spam folder. P
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Rank: Super forum user
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Have you asked you LEV supplier? I know when we introduced LEV in light of the chnage in clasification of mild steal welding we already had point LEV for dieasel fumes - they were able to show why the system was not suiatble for the welding - and not just as a sales pich as we had to go somewhere else for the welding extractiion kit.
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