Hobbywing made FAN-5010SH-5V-5300RPM@5V-BLACK-B 86080110 (HW-86080110) Cooling Fans Motor / ESC / Cooling Fan
Using this type of fan attached to your ESC heatsink, you will have the maximum cooling performance.
Specifications: Oil/Porous Bearing / Non-waterproof / JR-3P Male Plug / L=200MM
Applications: regular applicaion. suited to motor air-con