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I have been in mine a couple of times there is a 2" flex hose that runs down in the belly and dumps warm air below the floor. It is not a great system but if you dump to much air off your furnace you are losing it from in the rv where it is needed the most. Also if you are only losing hot water you may have a bad ck valve at the hot water heater I had to replace mine a couple of months ago. ozz had great pics.
bobby
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