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Coming from your furnace the under belly has a 3" duct that dumps warm air from your heater that will help keep the tanks and water lines from freezing. But that 3" hose has it's handful to keep near 90 square feet above freezing. The more you use the heater that helps to heat that area. There are many gaps, sags, larger holes than needed of pipes, frame members, cut in that black under belly that allow air to get in and out. Also for every slide out you'll have slide out tracks and holes for the hydraulic rams to work.
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