Furnace duct to ???? - Homesteading Today
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  #1  
Old 11/24/13, 07:13 PM
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Furnace duct to ????

Had a new furnace and central air put in a couple years ago, and all new ductwork. Unfortunately, I have come to realize that one of the ducts ends up coming up behind my kitchen cabinets...somewhere! Can't find out just where...feel no air coming into the cabinets, nor under the kitchen stove.

The furnace guy is coming tomorrow and he will probably tell me there's no problem if I complain to him.

Truthfully, *IS* there a problem? I think it would be nice if the back of my house was as warm as the FRONT of the house. Would the duct going nowhere cause me to use more fuel? Would it work the furnace harder? What are the negatives?

Mon

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Old 11/24/13, 07:54 PM
 
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Hopefully it was closed off, probably was since you feel no heat. If it is at the end of a run and wasn't insulated it would lose heat, radiated from the duct. Other wise no real negative. You could have it moved to someplace so it could be used. I do not understand why a new system was run to that place if not used. Was there an old duct system?

....James

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Old 11/24/13, 08:37 PM
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Originally Posted by jwal10 View Post
Hopefully it was closed off, probably was since you feel no heat. If it is at the end of a run and wasn't insulated it would lose heat, radiated from the duct. Other wise no real negative. You could have it moved to someplace so it could be used. I do not understand why a new system was run to that place if not used. Was there an old duct system?

....James
That *entire* wall is cabinets (all 8 foot of it), and have been there since about the 1930's. And yes, there was a duct there, from BEFORE the cabinets were installed (apparently!). It goes directly from the furnace to the wall (about 10 foot) and the only insulation is about 6 inches from the wall...looks like that old asbestos stuff.

When they price the job, don't they check to see where the ductwork GOES?

Mon
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Old 11/24/13, 09:51 PM
 
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There's not a vent in the toe-board under the front edge of the cabinets is there ? I'm sure you would have noticed it if there is .

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Old 11/24/13, 10:13 PM
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Originally Posted by WV Hillbilly View Post
There's not a vent in the toe-board under the front edge of the cabinets is there ? I'm sure you would have noticed it if there is .

No, no vent there.

Mon
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Old 11/24/13, 10:44 PM
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could it possibly be a return

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Old 11/25/13, 09:23 AM
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No, it isn't a return.

Mon

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  #8  
Old 11/25/13, 10:02 AM
 
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Is the furnace guy who's coming out, the same guy who did the install? Is all the duct work in a basement or crawl space? Do more investigating to see if this is, as already mentioned, a WA (warm air) or RA (return air) run. Warm air runs can have dampers in them. Return runs will not. Also, it's quite possible that the WA runs will be insulated while the RA runs will not. It's also possible that when they were doing the install, they simply forgot either the register boot or the register. If these cabinets are along an outside wall, I'm guessing it is a WA run. Don't be afraid to ask the contractor questions. You paid good money for his knowledge and skills and he should want to make sure you are a satisfied customer.

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Old 11/25/13, 11:51 AM
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The ductwork is in the basement. I know where the returns are, 2 of them for a 750 square foot house. And that ductwork that goes to the wall DOES have a damper.

It probably shouldn't bother me that much except that my bedroom is usually cold as all get-out and I have to just keep the door shut in the winter so the rest of the house stays warm....and that the carpenter I had come by last spring about choked from laughter when he saw the duct leading to the wall behind the cabinets....he KNEW it was a dud. Seems the furnace guys should have picked up on that too, when they were doing the work!

Mon

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Old 11/26/13, 07:00 AM
 
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Is it outside air? Some furnaces will bring outside air/fresh air into the furnace. An OA duct will have a damper, so as to be able to roughly control how much OA comes into the furnace.

Now if is it a Supply Air/Warm Air duct and is just blowing into the wall. The you are wasting heat/energy. But if it is SA/WA it should also be insulated. As others have said Return Air duct isn't always insulated and the same for Outside Air.
One thing you may be able to do is pull off the elbow where it turns up into the wall and see if it is blocked/capped or see if it goes outside.

Also depending on the type of furnace you are using. It could be Exhaust or Combustion Air for a gas furnace.

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  #11  
Old 12/01/13, 05:16 AM
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Originally Posted by frogmammy View Post
No, no vent there.

Mon
but maybe there is supposed to be and someone covered it up!
more return air helps, can't move heat to a high pressure zone and the return lowers the pressure. what kind of furnace?
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Old 12/01/13, 05:27 AM
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So have furnace guy install a floor boot and vent in front of the cabinets, shorten the duct run by a couple feet, problem solved.

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Old 12/03/13, 01:33 PM
 
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was it put in to the wall cavity to keep pipes from freezing?

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