We have been having this issue for a while now, the water entering from the furnace will make its way to our outside TV area then to the kitchen floor, what a crazy design. We have removed the furnace cover and caulked the entire area with negative results. The water just comes down the side of the motor home and easily enters the furnace chimney. How I have been handling this until someone comes up with a solution is to extend my awning out about 5 inches when we are parked, this diverts the rain from running down the side of the motor home into the furnace.
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