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Old 02-23-2014, 11:39 AM   #1
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1973 25' Tradewind
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Suburban heater: Help with proper ducting

Hi folks,

Best way to run ducts I am going to be installing duct work off my Suburban nt 30sp. In my 73 Tradewind.

I plan on using the flex 4” ducts. Would some folks show off there work to me with some pictures I would love to see how your runs were made and perhaps describe what you did.

My understanding is I will need to use 3 of the 4 outlets in the box for proper functioning. I am concerned about not getting them too close to the

I am building cabinets so I have flexibility that way. Any advice would be greatly appreciated

ALSO if you would.

I down loaded these installation instructions via the Vintage Trailer Supply Website. Love VTS.

http://www.vintagetrailersupply.com/...and%2034sp.pdf

Here is where I embarrass myself and then you give me the ah ha moment.

What are they referring to below from instructions “return air opening”? Is it slots in the furnace housing?

Taken from above instructions manual

“2. No outlet register is to be placed within 18” of the return air opening. Any register installed at 18” should never be adjusted to blow the outlet air toward the return air opening. If a register is installed on a wall 90 degrees to the return air, it can be less than the 18”.”

Anyway thanks in advance.

Tony
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Old 02-23-2014, 03:12 PM   #2
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Your furnace will not be happy if it collects heated air from a nearby duct directly into the return air grill. That is the reason for the separation listed in the directions. This situation could lead to rapidly escalating temperatures in the furnace and would probably result in activating your ECO sensor.

One thing to also remember; each furnace requires a specific amount of unobstructed square inches of duct area to allow for the proper operation of the unit without over heating. Be sure to check your installation manual for this specification.
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Old 02-23-2014, 05:43 PM   #3
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thanks for the answer what I still hope to confirm is the question below.

What are they referring to below from instructions “return air opening”? Is it slots in the furnace housing?

The pictures show my situation. The duct housing on the right I wanted to "stub out" to the adjacent cabinet wall heating the forward portion of trailer. The other two will run to bathroom and under side twin so they will be far away.

The return grill would be on a door in front of water heater. I will enlarge the opening in cabinet compartment divider if entering air needs to circulate better. Does that seam like it takes care of things? Any further advice or suggestions?

many thanks

Tony
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Old 02-23-2014, 06:41 PM   #4
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I believe they are referring to the minimum size of the opening you need to provide in your cabinet.
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Old 02-23-2014, 07:29 PM   #5
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I would add a grated opening in front of your furnace for the return air of at least 24" X 18" or larger, according to the requirements listed in your installation manual. This is the size that I typically see in most of the furnace equipped units that I work on.
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Old 02-23-2014, 09:08 PM   #6
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Thanks all.

Lewster, perfect that is what I will do.

So the duct stubbed off the side is ok?

Thanks for sticking with my question and concern I want to do it right. Too much work to do it wrong too many times.

Tony
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Old 02-23-2014, 11:23 PM   #7
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I would strongly recommend you use all 4 outlet openings, rather than the minimum of 3 that they say you can use. That will keep the furnace from running up against the high temp limit switch, will reduce the temperature of the heat from the ducts, and will improve the overall efficiency of the furnace, as well as the comfort of the trailer.

When I changed out the furnace on my 310 Motorhome adding an additional duct was the best improvement of the swap.
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Old 03-09-2014, 12:57 AM   #8
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I'm in the middle of a furnace replacement as well. I'd love to use all 4 ducts, but like the photos above I would then have 2 ducts that are about 10-15 feet long (one going all the way back to the bathroom, and one I'm adding in the bedroom under a twin bed) and I would have 2 ducts that are about 1 foot long, both dumping into the front dinette area. It seems that the front of the trailer is going to be much warmer than the rear with this arrangement. I'm trying to figure out if I could run one duct up over the furnace and out into the kitchen area, just to the left of the furnace.
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