I am not a chainsaw carver but I am a power carver. If you make sawdust while carving, please wear a mask. I am a huge fan of the Dust Bee Gone mask. It is pricey at the outset...about $40. But it is a light weight, re usable mask, it's washable. You can breath without fogging up your safety glasses too. It comes in different sizes and if you have a prominent nose or need a special fit for some reason, the lady who invented them, will be happy to work with you and create a custom fit mask at no extra charge. I had my first one for over 5 years and it's still good. I just decided to get a custom fit one to accomodate my nose.
But if this is more than you wanted to spend, go to a woodsupply store and buy a package of the disposable masks that are labeled for wood dust. Please wear protection. We don't get many second chances when we find out we screwed up in that department.
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carving.
ps, I took my power carver to a friends house once and we worked outside. There was a pretty good breeze so I figured I didn't need my mask. I was shocked later on that day to see just how thick the fine wood dust was all over my face.....