On mine, no fridge vent on roof. Used gray water vent stack which went down to the control center then down to basement. Wire went inside the vent cover then down the outside of the stack pipe. Ran wires to controller which I installed at the control center then down to the batteries using wire loom to protect wires. Used wire ties along the way to secure.
2007 TropiCal LX towing 2012 Honda CRV, Goleta, CA
From the roof, down the Refer vent and you take off the refer vent cover on the side of the RV and then you can find a existing hole or drill one to run the wire into the RV where1ver you need it to end up, n1ear the charge controller or house battery. It is easier if you remove the 4 screws on the roof that holds the refer vent in place. That way you have a visual to guide the wire down, staying away from the exhaust stack. Be sure that you have some dicor caulking to cover the screws when you reinstall the screws.
Othertonka 2004 Southwind 32VS 8.1 Workhorse chassis 2002 CRV Toad U. S. Gear Unified brake system Retired Fire Captain, SFD
Many folks use the fridge vent. Some use the plumbing vent. My prewire from the Factory was down the fridge vent.
Regards, Don My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.