1. Twister BEARING BEARING BATWING Technology Blade Design Installation 1 PC power off at all times during installation 2 Please see the right figure for the airflow directions 3 Install the fan on the case with the 4 screws 4 Connect the PWM 4 pin connector to a specific PWM or 3 pin 12V header on the motherboard Or use the enclosed 3 pin to 4 pin adaptor to connect it to a 4 pin Molex from power supply PWM control requires a PWM enabled motherboard and connection so that you can adjust fan speed via BlOS motherboard Connect to 3 pin to 4 pin adapater PWM connector connect to M B Detaching fan blades Carefully push out the fan blades with your thumbs in the inner area back view side view Airflow Airflow direction direction maaar SIUEN Roela direction Reattaching the fan blades Press the center of the blades towards the frame until it clicks