It's normal. These types of refrigeration use a heat source (propane or electric) to drive the cooling process.
Excess heat is vented, usually through the roof. The heated air being vented heats up the passage on its way out. As far as I know, there is no insulation from the factory for this passage.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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