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 - Pop's Tractor of Gold - by Gary Teate. My father was a simple man but could repair just about anythin mechanical that was ever made. From the time I was a young boy growing up in Jacksonville, Florida, I would spend a considerable amount of time helping my father repair or rebuild equipment and engines, etc. on our 2 1/2 acre "spread". Pop always dreamed of having more acreage out in the country where he could retire and tinker as much as he wanted and often reminisced about his boyhood days on his grandfathers farm in Montecello,
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