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RVLOVENT 12V RV Roof Fan Vent 14'' 10 Speed Reversible Manual Lift . 977 ratings . View Product Buy it on Amazon. More info 1. Product Features. 10-SPEED FAN ...

A 12-volt lead-acid/AGM starting battery is used to start the engine, while a 12-volt RV "house" battery bank is used to run the DC-powered appliances, such as fans, lights, and water systems.