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if you can't smell the solvent, then the charcoal filters are still working
if your lungs ache, it could be a simple matter of the filters are clogged with dust, is there a prefilter for large particles. It seems like your lungs would need to work the muscles harder to inhale. Be sure to use and change your prefilter.
I spray a lot of paint and lacquer for work and have to change out the filter often because of overspray, they still work but look clogged.
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