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is this furnac exhaust draft tube to outside of house impractical and removable?

is this furnac exhaust draft tube to outside of house impractical and removable?


  #1  
Old 02-15-13, 07:42 PM
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is this furnac exhaust draft tube to outside of house impractical and removable?

The person who came and worked on my furnace wondered about this draft as my basement is fairlywide/spacious. He said it shouldn't be nescicary and seems very impractical.

connected to the Combustion exhaust draft door is a series of piping that runs out a window frame.
the main trunk on the left goes straight to the chimney, and connected to the draft door on it is the series of piping to the right, that runs suspended from the basement rafters.

The inlet is fairly awkward and I'd also like to be able to board up the window frame it is in.

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  #2  
Old 02-15-13, 08:16 PM
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You could do it on a temporary basis to see if the removal would cause any problems.
 
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Old 02-15-13, 10:10 PM
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What would be something to keep a close eye on?
I can't help but wonder why it was put there but if its pointless as I was told.

also should I unplug the two small 1/2 in diameter thru holes in my basement wall that lead straight outdoors? They are right behind the oil tank and were likely there for draft?
 
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Old 02-15-13, 10:36 PM
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Those two small holes were probably from when the tank was outside and they ran the lines thru those holes to the oil burner.

It's not pointless....just probably not terribly effective. Someone thought that instead of the flue drawing warm basement air up the chimney......they would draw in outside air. In theory a good idea but cold outside air is not really effective at helping the flow up the chimney in a gravity flow situation.
 
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Old 02-16-13, 01:19 PM
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Those two pipes in the picture are exhaust & go out thru a basement window????
I was thinking they were intake air?? I'm now totally confused.
 
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Old 02-16-13, 01:35 PM
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The right piping is connected over the draft door on the furnace exhaust and rather than pulling basement air to assist the chimney flow it pulls directly from outdoors
 
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Old 02-16-13, 01:38 PM
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Bad idea. That outdoor air is likely to cool the exhaust to near condensing temperature.
 
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Old 02-16-13, 04:52 PM
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Sweet, the furnace seems to run fine without it connected, I smell the combustion a bit moreso in the basememt now, co2 detectors aren't tripping, so I'm going to pull the ductwork apart and board off the window.

I get tiered of ducking under the damned assembly when in that corner of the basememt.
 
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Old 02-16-13, 04:54 PM
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You shouldn't smell anything. If you do, you have a problem & a potential big one. Did you cap off the branches going outside?
 
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Old 02-16-13, 06:23 PM
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just smells somewhat like ash and mildly of smoke when i'm in the vicinity of the stack.

here are better pictures of the Draft door as it looks right now with the duct disconnected.
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Old 02-17-13, 08:43 AM
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Is there a return plenum on the furnace? If so are there any return vents in the basement which are open?
 
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Old 02-17-13, 12:17 PM
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Lowboy style plenium both vents on the air in side are wide open
 
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Old 02-17-13, 02:06 PM
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You are drawing return air from the basement??
 
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Old 02-17-13, 04:20 PM
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Only for the blower & stack draft currently
the household airflow is circulated in. The upstairs. That air is not pulled from the basement
 
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Old 02-17-13, 07:06 PM
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"Only for the blower & stack draft currently"

Blower?
 
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Old 02-17-13, 08:51 PM
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Burner, I keep referring to it accidentally as a blower as the flame retention part Is disabled
 
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Old 02-18-13, 07:46 PM
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Sorry, I still don't fully understand. Some more pictures with a wider view might help.
 
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Old 02-19-13, 12:39 AM
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Left split of plenum is Furnace air in from upstairs vents.
Right side is heated air out.

Burner is in bottom right corner of furnace.

the draft regulator is slightly up from the stack control.

I read up a bit on draft regulation.
the only potential reasons I could see for that are
#1 the combustion air is pulled from the basement.
#2 the chimney does not have a cap on it.

I'm gathering now that the homeowner did the modification, so I'm not sure if those are major factors to warrant that the draft regulator needed to pull air straight from outdoors.

is there any easy way to test for negative air pressure in my basement? I
 
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Old 02-19-13, 07:16 PM
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About the only way to check for negative pressure in the bsmt would be to close the basement door except for a crack & use a small flame (candle or lighter) or a source of smoke such as an incence stick at the crack & watch which way the flame or smoke went. If it pulls toward the bsmt, there is a negative pressure in the basement. That furnace looks like an old General or Delco.
 
 

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