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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) APPLICATION -Refrigeration/ fridge cooling fan -Ventilation grilles -Motorhome vent fan TTC-SC20(B) : 120mm SPECIFICATION Outline Dimension: 240 x 120x 30 mm Fan Dimension: 120 x 120 x 25 mm*2 Rated Voltage: 12V DC Rated Current: 0.56 A Power Consumption: 6.72 W Rated Speed: 400~2000 RPM Airflow: 121.13 CFM Static Pressure: 0.12 Inch H₂O Noise Level: < 32.9 dBA Bearing Type: Z-AXIS Life Time: 60,000 Hours SPEED CONTROLLER Outline Dimension: 85 x 37x 15.5mm Input Voltage: 12V DC Output Voltage: 7~13.8V DC Max Output Current: 1A Temperature Measuring: 20°C~ 45°C (500~2600RPM)