If you look at the hole throught the frame were the hydraulic cylinders are connected to the slide you will see a 3 inch hole, time the amount of slides. That coupled with the way the under belly is fastened to the frame leaves a fairly large breezeway for air penertration into the underbelly and up throught the heat registers and the return air grille. Try turning on the fantastic fan with no windows or other vents open, it pulls air from where ever is available, on cold days that can freeze you out.
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