Titan- 12V/ 24V DC 120mm Multi-Function Rack Mounted Double Refrigerator Side Vent Fan with Speed Controller for RV, Motorhome, Caravan- TTC-SC09TZ(B) WIDELY COOLING APPLICATION- Great for refrigerator vent fan in your camper van, camper truck, caravan, motorhome, and ventilation cabinet fan in home theater cabinet, audio cabinet, ventilation cabinet, network closet, etc. FLEXIBLE RACK MOUNT SET DESIGN - Accept to install on any places you want to enhance ventilation and cool down temperature for your application. POWERFUL SPEED CONTROLLER- With high value aluminum speed controller, it can switch auto control with temperature sensor or manual speed control depending your need. SILENT OPERATION FAN - Take TITAN professional 9-blades kukri silent fan, this fridge vent fan or multi-purpose fan provides you the quietest operation experience ever without any disturbing. WARNING: Do not attempt to revise polarity to change the airflow direction. It would not revise the airflow direction. It will only cause permanent damage to the fan controller. The airflow would blow out from the cross grille side of the fan. Please connect the cable to the same polarity (positive to positive/ negative to negative) <a href="https://www.amazon.com/b?node=14770868011"> International products </a> have <a href="https://www.amazon.com/gp/help/customer/display.html/ref=nav_cs_help?ie=UTF8&nodeId=202045290"> separate terms, </a> are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. Manufacturer warranty may not apply <a href="https://www.amazon.com/b?node=14770868011">Learn more</a> about Amazon Global Store.