The small fan near the floor in the bathroom is triggered by the heating system however, there is no duct going to it. It only draws warm air from the heat exhaust duct under where bunk duct blows heat out. If placed properly from the factory it should be directly across from that exhaust port and it will pull a small amount of heat into the bachroom. It works this way in my 2017 30.2
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USN - RETIRED NUKE
Taunton, MA
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