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Old 12-01-2011, 12:14 AM   #1
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2008 Forest River pop up Suburban Furnace

My furnace ignites fine,but there is more heat passing out the the exhaust vents than inside our camper,is it possible the furnace was installed backwards???

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Old 12-01-2011, 10:48 AM   #2
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NO!!!!!!!!. What is going outside the camper is deadly, it is the product of combustion. All furnaces are heat exchangers. The flame is burned in a chamber, and the combustion gasses are sent outside, through some sort of chimney. Air is blown across the chamber, and ducted in to the area for heat. It is not 100% efficient, but it works, and it's the best we have going right now.

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Old 12-01-2011, 09:40 PM   #3
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Efficiency on these types of furnaces is rather low. I don't know the exact numbers but I would expect 80% efficient or less. At 80% the exhaust will still be quite hot. Compared with a 90+ efficiency home furnace, the exhaust is super hot (my +90 uses PVC for the flue - so its pretty cool).

I also have a 250,000 BTU gas heater in my pool, 85% efficient and trust me, the flue vent is really HOT!

I think you are fine as long as the temp of the air coming out of the furnace inside the camper is 15-25 degrees above the inside temp of the air in the camper.
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