Is it safe to use the Big Blue 400 Pro indoors?
No, the Big Blue 400 Pro must not be used indoors. A 'Danger Using Generator Indoor' label (part number 272340) is affixed to the unit, and a separate warning label addresses the dangers of breathing diesel engine exhaust (part number 282178). Always operate the unit in a well-ventilated outdoor area.
From the official Miller Big Blue 400 Pro Welding Machine manual, page 3
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