See if you can lift the kitchen sink cabinet floor panel by the door. you should be able to see four ducts connected to the furnace. There should be two very short flex ducts that terminate at floor and two others - one very short run to kitchen counter vent and another that goes to bathroom vent. One of the floor connections feeds bedroom and living room floor vent and the other should feed basement bays. While you have that panel out you can improve air flow by cutting out excess flex duct. I have never seen a wet bay vent just figured they are over tanks. For a pic of sink ducts after I cut the excess see post 1270
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