Our 2005 46 Voyager has two heads and two separate vent lines w/ filters. The starboard side is easy to get to through a access panel in the salon. The port side on the other hand has two AC units in the cut out. I can take a flash light and see the vent filter forward and high in this port access. Getting to it is another problem. I think there is a possibility that the vent line has a loop which would possibly allow the filter to be pulled down and back to gain access once it was removed from its wire saddle. Has anyone had any luck getting to this filter?