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Onawayman · 11-17-2012, 02:20 PM

Well I fixed the furnace in my 86 sovereign (faulty sail switch) and now have some duct questions:

I have one duct going to the front of the camper (4 inches long) and two ducts going back to the rear. One dumps into the bedroom and the other goes into a plenum box under the closet. The plenum splits into two smaller ducts, one to the bathroom and the other was open allowing it to dump under the closet. (I have no idea why???)

Can I run just one duct to the back with a branch going to the bathroom? Or do I need both going to the back for flow?

Why was there an open port in the plenum box? The duct going to the bathroom was about 5 feet too long and wrapped up under the closet. I have a hunch that the PO did some "on the farm" engineering.

dznf0g · 11-17-2012, 02:59 PM

Just be sure you have the furnace mfr. recommended minimum square inches of duct work cross section to prevent a furnace overheat.

I suspect that the open fitting under the closet used to have a duct running to the water/waste tank area for heated tanks in winter. Look down through into the belly at the plenum and see id there is a loose 2" duct end down there.

eubank · 11-17-2012, 02:59 PM

The one split at the end of the line may have been for the tanks down below. Check for a hole through the floor to see if that was the original design.

Lynn

Onawayman · 11-17-2012, 03:38 PM

I have a small duct right below the furnace that I believe is for heating the plumbing stuff. I did not see any duct hose in the open space under the plenum. I thought the same thing, but it really effects the amout of air going to the bathroom.