| Re: [GMCnet] Furnace duct in 23' '73 [message #327425 is a reply to message #327423] |
Fri, 22 December 2017 14:51   |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
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Hey, Peer,
I don't own such a unit but I have read here on the forum that on some coaches, there is an inline duct booster fan for the duct behind the stove that often is inoperative, disconnected, too loud, or ineffective. (Might be only for 26 footers). One theory is that the lion's share of the air is cycled from outlets close in proximity to the cold air intake to the heater, thus, it is often the case that very little heat comes out of that rear outlet, same for the bath. A better booster fan might help, the ideal situation (so I think) is a cold air intake located back there (good luck finding room for that!) It might be more effective to convert the present duct into an intake, so that heated air from the front has to go back there to be recycled. It would involve restricting the present intake near the heater and there might be engineering considerations with respect to air flow sufficient to keep the heater from cycling on the overheat switch. Adding a duct outlet often helps with that cycling as well. I hope this helps some. The take away is that few of those outlets at the back of the RV are really effective. Same goes for long travel trailers, I have spent a lot of effort, (insulated metal ducts that are smooth inside, extra outlets), to discover that the bathroom had negligible heat, same for the rear bedroom. I've no direct experience with the GMC, as our heater has had all the ducts removed, and the P.O. says that the heater is so hot it will "run you out of there". We've never had to use it yet. Good luck with your heat situation.
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
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