Unless the manufacturer specifies otherwise a 13 A fuse would protect the lead from the FCU to the fan against short circuits perfectly fine and everything else should be taken care of inside the fan unit. You can of course fit the smallest fuse necessary for the running and startup current of the fan motor, which is probably 3 A. I'd consider the fuse size in this application more of a matter of personal taste unless there are specific requirements in the manual.
So I fitted a new 3a fuse and cleaned out the carbon filters that were on either side of the motors. They're currently drying, so I thought I'd check the fan out... the first thing I noticed is that it appears the fan is blowing air from one side (about half the fan) and about a third blowing on the other side.
I think I read somewhere that sometimes this is a circulation setting when fitted with carbon filters? Does anyone know how to change this to extract, or have any views on this is more effective?
Anyone have any views in why there is a secondary fan within the ducting that can be switched on and off and whether this would provide any real advantage in turning it on?
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