[C320-list] Air duct to engine

[Graeme Clark]

On the transom there are two air vents, one is the exhaust vent of the extractor duct from the engine compartment running through the electrical fan*

The other is - on my yacht - a long white plastic duct which terminates in the aft locker space, under the rudder cables just lying on the floor!
I suspect this is not where it should terminate!

I have a nasty suspicion that the previous owner may have tampered with it whilst installing the ducting for a cabin heater but I'd sure like to know where it's supposed to go and what it does, as everything seems to work fine at the moment!
Thanks
Graeme Clark
#366, Jaskar

(*By the way, the fan will only switch on if the ignition is switched on. This means if the engine isn't running I get the low oil pressure sounding which if I run it for any length of time, annoys neighbours! Any reason I can't rewire  it to a different live source?)