Wire question for Maxxair fan install
I have a question about a mixing wire sizes for a Maxxair fan installation. I have a 2019 Minnie Winnie 31G and I am installing Maxxair Deluxe fan in the bedroom. I have run 14 gauge over to the cabinet above the headboard of the bed. There is 14 gauge wire there feeding the overhead LED reading lights. I also found an unused plug next to the water tank under the bed that is for the tank heater that I do not have. This wire is 12 gauge and can be accessed under the bathroom sink. My question is would I be better off just tapping into the 14 gauge wire feeding the reading lights or tapping into the unused 12 gauge wire for the tank heater? My original plan was to use the LED light circuit 14 gauge to 14 gauge. When I found the unused circuit I thought this would be better but wasn't sure about mixing the 14 gauge wire with the 12 gauge wire. The Maxxair fan requires a 5 amp service and both circuits are fused with a 15 amp fuse. I may be over thinking this any help would be appreciated.
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2019 Winnebago Minnie Winnie 31G
2018 Jeep Wrangler JK
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