That’s a point, there’s a spur for the extraction fan, which you could run another spur off.
Can you spur off a spur?
Provided they are fused appropriately yes.
I think the confusion comes from the common use of spur to refer to both fused and unfused spurs - the latter being limited to one per socket
The common error is people not changing the supplied 13a fuse in the FCU to a smaller one where appropriate.
@Airhead started
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That’s a point, there’s a spur for the extraction fan, which you could run another spur off.