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[quote]Originally posted by Paddler
Running the fan with the furnace turned off will draw warm inside the rig air (its a closed system)and circulate it. This will probably cause a cold draft within the rig, but it will slightly heat the underbelly.
On the outside of the unit their is an Exhaust and Intake for the furnace.With the fan running you are going to be drawing cold air from the outside, I do not understand when you are saying a "Closed System"
An RV furnace draws in out side air for combustion
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