Hello Pascal,
Sorry for the slow response.
I don't have any ventilation from the cockpit although the aft end of the locker is open into the stern space of the boat where the fuel tank is etc. It did initially worry me whether the compressor would have enough ventilation since the locker is quite full of gear but it has worked quite happily for years so it seems to be ok.
Maybe my boat is slightly different; my gas bottle is closer to the hull than the middle of the locker and so there is room for the compressor between the bottle and the cockpit side of the locker if you follow me?
I can try and take a photograph next weekend if this would be useful to you?
Regards
Jonathan
Tilikum
P325/23