See Duchmen's point. If the vent is blocked the air being pulled into heat exchange is air pulled totally from around baggage doors and other air gaps. The warmer the air entering the exchanger the warmer the air exiting the exchanger.
My 1996 Sunnybrook had the furnace mounted under the refrigerator and was in conditioned air. Much more efficient but doesn't protect the tanks.
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Paul Northport,AL W4XH
2013 358 RLT Mountaineer
2008 Silverado Duramax
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