For the benefit of everyone reading the thread, The air your pumping in is not the same as outside air because you are breathing it after it goes through your fresh air pump motor. On most systems it is filtered twice. Before the pump an intake filter just in case your pump is getting paint or sand from a wind change or whatever. Then a second filter is down stream of the pump to protect you from oil, oil fumes or the fumes from the arcing of an electric motor contacts, depending the type system you have. You make the same choice if you are using your air compressor as a fresh air source, your getting the air in the tank with compressor oil fumes etc and no filter. In both types your going to get whatever is in the hoses after any filter, sent to your mask.To add to your confusion, there are hvlp systems that provide air to the paint hood/helmet and the paint gun that must have a filter. The one shot tractor painter has probably had a lot of experience with dust, pesticides, fertilizers and weld fumes as well and will hopefully not overlook protection from iso's, paint fumes, or sand clouds. My original point was his shop vac system is better than breathing paint or sand or iso's. It's in the first sentence, and hard to miss. I guess were all on differant levels. I hope that all the discussion over the same point, doesn't discourage others from sharing their idea's and experiences for fear of someone responding to their post negatively.
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