Can I use the pressure washer indoors or in a garage?
No, you must never use the pressure washer indoors, in homes, garages, crawlspaces, or other partially enclosed areas. Operating the engine indoors can be deadly within minutes due to carbon monoxide buildup, which is odorless and invisible. Always use the pressure washer outdoors, away from open windows, doors, and vents.
From the official DeWalt 3300 Psi Pressure Washer manual, page 6
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