Original message
| ericmiller
 |  "furnace supply duct"
, posted Sat 19 Apr 17:46  
Currently my furnace has about ten feet of duct length to the supply vent. At one point long long ago the opened into the original ducts on the floor of the first floor. (furnace is in the basement). now on of these ducts is closed and the end of the supply duct is open at the ceiling of the basement, and the second supply duct is behind an entertainment center on the first floor. I'm in the process of finishing the basement. (slow progress) could I open up the supply of air right before the filter at floor level in the basement. I would put the proper covering over the opening but can I open the duct about one foot from the supply filter?
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Replies:
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| vandvmechanical
| "Re(1):furnace supply duct" , posted Sat 19 Apr 19:25
If you are just looking for some temporary air, you could install a ceiling register on the supply plenum that you can open and close as needed. Just make sure you are installing it on the square duct ABOVE the coil. This is assuming your furnace is an up flow. If the coil is on the bottom of the furnace, install the register BELOW the coil.
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| | ericmiller
| "Re(2):furnace supply duct" , posted Sat 19 Apr 19:54
how do i know if the coil is down or up? what does it look like?
thanks
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| | ericmiller
| "Re(3):furnace supply duct" , posted Sat 19 Apr 19:56
i'm not looking for temporary air. I would supply the furnace with air from the basement 100% and closer to the furnace will offer less resistance over having to go ten feet in the duct currently. Is this correct?
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| | vandvmechanical
| "Re(4):furnace supply duct" , posted Sat 19 Apr 22:09
Ok, I think I understand.... If you plan on opening the duct with the air filter, that is the RETURN air duct. I would not do it the way you intend though. You still need to draw air from the upstairs too. If I were doing something like this, I would tap into the return air and add a return to the basement.
And TheDuke is correct. You must have combustion air coming from either outside or the attic. You don't normaly want combustion air coming from an occupied space.
Best bet is to have a pro come out and give you some tips.
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| | theduke03
| "Re(4):furnace supply duct" , posted Sat 19 Apr 21:34
So you're finishing your basement? Did you make plans to provide adequate combustion air for furnace? Probably not. Also I've never seen a supply filter but I think you mean return(air that goes into furnace).
Some of the pictures displayed here are brought to you by Houston204. Be Safe.
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| | ericmiller
| "Re(5):furnace supply duct" , posted Sat 12 Jul 20:22
yes i must mean return air( going into my furnace). so my question is can I open up the duct just before the return air filter allowing direct air inlet into the furnace. Drawing all air from the basement.
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