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My 2014 Alpine has furnace return vent on stairs as well... I block off with a piece of card board to keep out heat during summer... during winter use I remove to allow the furnace to breath better...
However... on our last trip just a week ago we used furnace in the early mornings for two weeks and I forgot to remove cardboard... temps were down to 17 degrees a few evenings.
Suburban furnace ran fine and had no issues ... there is a plethora of open space under the flooring with... in my RVs case small open holes that the furnace can draw outside air as well as the air in that huge basement and underflooring area
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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