I run my fans off a splitter that's connected to the esc fan plug. Worked fine on my blx185, max6's and max10 sct. For my castle esc's, I run a splitter clear to the receiver because if the esc does have a fan, it's controlled by the esc and only comes on when the esc is hot and needs it. However, I like to know my fans are working any time I look at them, so I run all fans to the receiver with them so they are always on. Even then, I leave the splitter outside the receiver box so if a fan dies, I can replace it without dealing with the receiver box. Fans are a bit of a consumable item, so being able to replace them easily/quickly is helpful.