There is a hard plastic covering the length under my Hemisphere and the heat ducts run under the flooring, encased in that void area and heating it up to a degree. Your unit is most likely the same. Your unit is most likely not a 'true' 4 season unit unless it is indicated on the side of the unit and in your camper material.
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Brother Les
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler
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