My fan like you are describing also has a built-in lamp. Pretty handy item to have. Of course if you need a real good ac/dc fan go look at the O2-COOL fans at WALMART. I got two of the 10-inch models and they are really great to have around the POPUPs.
Sometime we use a low profile oil-filled electric heater in our POPPUP as the furnace and blower are just either way to much heat, too noisy, or draw to much current from the batteries. We would rather use the sites 20A service on the same 30A pole to run our oil-filled electric heaters and not use up our furnace propane. If we need to move some air around more we sit the O2-COOL fan behind the oil filled heaters and it work great. The oil-filled heaters is very safe for the POPUP as there is NO VISIBLE flame, no burned air smell, no noise and to me is the safest type electric heater you could use in a POPUP or any other trailer where there are kids and animals.
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"