I have a 1992 Bryant 20' with 305 Mercruiser. The ventilation hoses are beat up and need to be replaced. Currently there are two hoses going to the vent cover on starboard side of the boat and then down to the bilge. One of the hoses is connected to the blower but the other just runs direct from vent to bilge. It is a tight space and I would really like to only run the one hose connected to the blower. Do I need the vent hose that is not connected to the blower. There is an additional vent cover on the port side so I would think there would be sufficient return air flow. Any thoughts would be appreciated.