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Old 2013-07-18, 1:43am
Alaska Alaska is offline
Alaska Boro
 
Join Date: Dec 10, 2009
Location: Anchorage, Alaska
Posts: 1,059
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Some fans are designed to be used in an explosive atmosphere. Thus the need for a motor and electronics that can not be used to ignite a source of fuel. i.e. exhausting oil base paint fumes. Or parts of the fan may corrode if the exhaust is wet.

Check with the manufacture and see what their definition is for "clean air only". Sometimes these warnings are in place for legal or warranty protection. Other times for a real purpose.
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