Yamaha EF3000iSE New Model Manual page 13

Cooling system
The centrifugal fan equipped on the rotor performs forced air cooling of the system over the path listed below.
Each part of the system is therefore continuously kept at a stable operating temperature with only a single fan.
I Cooling air path
I Control unit cover
I Control unit
I Alternator
I Engine (cylinder)
I Muffler
Muffler
Flow of cooling air over generator and muffler
Generator
cooling
Rotor Ass'y
air inlet
Cooling fan
Muffler Generator cooling air inlet
Generator fan
Overall flow of cooling air
Cooling fan
Flow of cooling air over generator and muffler
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Control unit
Intake box
Fan case
Controller
Cooling air inlets
Cooling air inlets
Battery
Recoil starter
Cooling
air inlets