Noctua 80x80x25mm 12 Volt 4 Pin Fan NF-A8 PWM – Coolerguys
Amazon.co.jp: Motor Cooling Fan, 35mm / 1.4" RC Motor Heatsink, 8.5V / 21000RPM Aluminum Motor Cooling Fan, Brushless Motor with 1/10 1/12 1/8 RC Sensor, High Speed Heat Dissipation (Red) : Toys & Games