I will pass up the temptation to link ceiling fans in trawlers to Hobbits & or decapitation.
I don't know if this helps but the ceiling fan in my trawler(so as we stay on trawler related issues* ) has a clockwise and anti clockwise switch, depending whether you want the air forced down or drawn up and away. Have you checked your fan? Also my blades have adjustable pitch.
Good luck, and remember to keep a low profile while on the lower helm station.