Is it safe to use the Trailblazer 325 generator indoors?
No — using a generator indoors can kill you in minutes. Generator exhaust contains carbon monoxide, a poison you cannot see or smell, and the unit should only be used outside and far away from windows, doors, and vents. (Page 7)
From the official Miller Trailblazer 325 Portable Welder Generator manual, page 7
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