YOKOMO RACING PERFORMER HYPER COOLING FAN (30 mm) (RP-033A) Hyper cooling fan. Maximum outer dimensions of the enclosure is 35 × 35mm, but the screw hole pitch of mounting is compatible with cooling fan and the same size of a typical 30mm size. Unique style of housing in the funnel shape with a thickness of about 16mm, effectively captures air, producing the best cooling effect. 　 Mounted or pasted to the chassis with double-sided tape, and secure it with screws via a mount. Please use it to connect to the BEC connector, etc. of the receiver with the included extension cord (about 16cm).