Speaking in general terms, supplied air is safer than a charcoal mask. It's positive pressure versus negative pressure. You need to make sure that any mask fits you well and makes a complete seal around your mouth and nose (including being clean shaven). Put the mask on, cover the inlet ports, and the mask should seal tight to your face and not let any air in when you try and breathe.
That being said, you need to do your homework and make sure your mask has the correct cartridges to filter out the bad stuff.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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