The issue - a small amount of water would always remains under the hatches of the engine room. Two small axiel fans were installed by Rybovich when the vessel was built in 1992. They would not create a noticable air flow.
The result - nearly 100% humidity levels in the engine room. This humidity would travel through the wooden floor into the salon above and into the carpeting, creating an odor throughout the whole yacht.
    As with most wooden boats, Arid Bilge pickups are placed on both sides of the keel, because limber holes are rarely cut through the keel. This is the battery compartment at the front end of the engine room, which is the lowest point in static float position. Water pocketing aft drains into this compartment.  These compartments along with two others are now maintained 100% dry by the Series 4 Arid Bilge System. 

The 1992 Rybovich, formally "Amnesia of Palm Beach", now renamed and in service in Hawaii.

This four Zone system was installed on August 20, 2007 and became our first repeat sale (see Tiara, same owner). Caught with two boats, the owner had been trying to sell this one for several months with no success. He called us and said that he probably would end up keeping this boat for a while, market's soft etc. you know the routine. Two days after the unit was installed, I get another phone call, "You know, I don't have to run the air conditioner all day to keep the humidity and odor out of the cabin". And about two weeks later, another phone call: "That buyer I told you about, well he bought it!" So here's the question - did it sell at the right price because the humidity and odor were gone? How important is that first impression when a potential buyer boards a vessel for the very first time?

The transom picture of Amnesia a 45 foot Rybovich Spencer.