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HVAC Discussions - Heating, ventilation and air conditioning.
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Posted by carlos gonzales on December 12, 2007, 6:47 pm
TIA:
My circa 1949 rental house an 18 year old furnace with a flue chimney which
appears to be asbestos.
It's gray and hard and flat about 3" x 15" and fits inside a wall. At some
time it was moved, but not the whole thing, just the segment between the
attic and the basement, to accomodate a wall move on the ground (only)
floor. I guess they didn't want to re-do the roof so there's a "Z" in the
attic, about 2' of horizontal run of same material, with glue and sheet
metal at the two 90° joints. I think they also cut that horizontal piece out
of the entire run of chimney, as it hangs from joists in the crawl space,
and is flush with the roof deck on top.
1. Tentant smelled gas in the room where the chimney runs up the wall.
2. Gas Company measured some CO in the crawl space and made me shut off the
furnace, saying "there might be a crack in the heat exchange"
3. HVAC guy wants to sell me a new furnace, since "there might be a crack in
the heat exchange" (Didn't verify any crack)
4. Where the furnace vent tied into the asbestos was very loose, there was a
½" gap all around it, looked like a good place for CO to get out. I sealed
it real good at that point.
5. Gas Company came back and measured 0 PPM CO in crawl space. (NONE!) but
then they measured 10 PPM in the house, and turned off the furnace.
6. I went on the roof to see if the chimney was clogged, and at 2' I hit
something hard
7. I went in the attic and found the 2 right angles, and decided to go get
drunk. (Just kidding about that last part.)
(furnace is 18 years old but works)
Asbestos and age aside;
1. Is it conventional or kosher to have a horizontal run in the flue vent
for the furnace/water heater?
2. Where the chimney is flush with the roof, it's not sealed, should the
chimney extend above the roof line?
3. Is there any kosher way to run the flue inside a wall nowadays?
4. I know I can vent a 90% or better furnace out the side with PVC, can I
vent the water heater out the side, legally?
5. What am I forgetting?
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Posted by on December 12, 2007, 7:42 pm
On Wed, 12 Dec 2007 18:47:53 -0500, "carlos gonzales"
>TIA:
>My circa 1949 rental house an 18 year old furnace with a flue chimney which
>appears to be asbestos.
>It's gray and hard and flat about 3" x 15" and fits inside a wall. At some
>time it was moved, but not the whole thing, just the segment between the
>attic and the basement, to accomodate a wall move on the ground (only)
>floor. I guess they didn't want to re-do the roof so there's a "Z" in the
>attic, about 2' of horizontal run of same material, with glue and sheet
>metal at the two 90° joints. I think they also cut that horizontal piece out
>of the entire run of chimney, as it hangs from joists in the crawl space,
>and is flush with the roof deck on top.
>1. Tentant smelled gas in the room where the chimney runs up the wall.
>2. Gas Company measured some CO in the crawl space and made me shut off the
>furnace, saying "there might be a crack in the heat exchange"
>3. HVAC guy wants to sell me a new furnace, since "there might be a crack in
>the heat exchange" (Didn't verify any crack)
>4. Where the furnace vent tied into the asbestos was very loose, there was a
>½" gap all around it, looked like a good place for CO to get out. I sealed
>it real good at that point.
>5. Gas Company came back and measured 0 PPM CO in crawl space. (NONE!) but
>then they measured 10 PPM in the house, and turned off the furnace.
>6. I went on the roof to see if the chimney was clogged, and at 2' I hit
>something hard
>7. I went in the attic and found the 2 right angles, and decided to go get
>drunk. (Just kidding about that last part.)
>(furnace is 18 years old but works)
>Asbestos and age aside;
>1. Is it conventional or kosher to have a horizontal run in the flue vent
>for the furnace/water heater?
>2. Where the chimney is flush with the roof, it's not sealed, should the
>chimney extend above the roof line?
>3. Is there any kosher way to run the flue inside a wall nowadays?
>4. I know I can vent a 90% or better furnace out the side with PVC, can I
>vent the water heater out the side, legally?
>5. What am I forgetting?
That Mexican guys aren't allowed to ask about Kosher. BTW,
can we see your papers, please ?
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Posted by jamesgangnc on December 13, 2007, 7:33 am
Maybe
Yes
Not really, you probably need to box it in somewhere following appropriate
code.
Yes, there are hot water heaters that can be side vented.
If you go with high efficiency furnace and hot water heater they can both be
vented out the side. They will be more expensive equipment but depending on
the location you may make up the difference in the savings on having a new
flue run to the roof. Plus there will be a 10% or so gas savings. If your
tenant is paying for the gas then maybe you don't care so much about that.
Otherwise look for a closet that you can box a corner in that's close to
where the equipment is and run a new metal flue to the roof. You are allowed
some horizontal run in teh basement but it will need to be in the vicinity.
You will probably need to just go straight out the roof with the new flue
and patch the original hole in the roof. If the house is single story with
a basement then that might not be so bad.
Don't let anyone try to talk you into removing that asbestos stuff. There
are lots of specialized procedures for remove asbestos these days and it is
usually pricey. Closing it off and leaving it in place is in most cases
perfectly legal. It's only when you start messing with it that all the new
handling rules kick in.
> TIA:
> My circa 1949 rental house an 18 year old furnace with a flue chimney
> which
> appears to be asbestos.
> It's gray and hard and flat about 3" x 15" and fits inside a wall. At some
> time it was moved, but not the whole thing, just the segment between the
> attic and the basement, to accomodate a wall move on the ground (only)
> floor. I guess they didn't want to re-do the roof so there's a "Z" in the
> attic, about 2' of horizontal run of same material, with glue and sheet
> metal at the two 90° joints. I think they also cut that horizontal piece
> out
> of the entire run of chimney, as it hangs from joists in the crawl space,
> and is flush with the roof deck on top.
> 1. Tentant smelled gas in the room where the chimney runs up the wall.
> 2. Gas Company measured some CO in the crawl space and made me shut off
> the
> furnace, saying "there might be a crack in the heat exchange"
> 3. HVAC guy wants to sell me a new furnace, since "there might be a crack
> in
> the heat exchange" (Didn't verify any crack)
> 4. Where the furnace vent tied into the asbestos was very loose, there was
> a
> ½" gap all around it, looked like a good place for CO to get out. I sealed
> it real good at that point.
> 5. Gas Company came back and measured 0 PPM CO in crawl space. (NONE!) but
> then they measured 10 PPM in the house, and turned off the furnace.
> 6. I went on the roof to see if the chimney was clogged, and at 2' I hit
> something hard
> 7. I went in the attic and found the 2 right angles, and decided to go get
> drunk. (Just kidding about that last part.)
> (furnace is 18 years old but works)
> Asbestos and age aside;
> 1. Is it conventional or kosher to have a horizontal run in the flue vent
> for the furnace/water heater?
> 2. Where the chimney is flush with the roof, it's not sealed, should the
> chimney extend above the roof line?
> 3. Is there any kosher way to run the flue inside a wall nowadays?
> 4. I know I can vent a 90% or better furnace out the side with PVC, can I
> vent the water heater out the side, legally?
> 5. What am I forgetting?
>
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Posted by jamesgangnc on December 13, 2007, 7:35 am
Ooops, I forgot. You could also switch to electric for the hot water heater
if the house has 200 amp service. If it's still a 100 amp service that
might not be an option.
> TIA:
> My circa 1949 rental house an 18 year old furnace with a flue chimney
> which
> appears to be asbestos.
> It's gray and hard and flat about 3" x 15" and fits inside a wall. At some
> time it was moved, but not the whole thing, just the segment between the
> attic and the basement, to accomodate a wall move on the ground (only)
> floor. I guess they didn't want to re-do the roof so there's a "Z" in the
> attic, about 2' of horizontal run of same material, with glue and sheet
> metal at the two 90° joints. I think they also cut that horizontal piece
> out
> of the entire run of chimney, as it hangs from joists in the crawl space,
> and is flush with the roof deck on top.
> 1. Tentant smelled gas in the room where the chimney runs up the wall.
> 2. Gas Company measured some CO in the crawl space and made me shut off
> the
> furnace, saying "there might be a crack in the heat exchange"
> 3. HVAC guy wants to sell me a new furnace, since "there might be a crack
> in
> the heat exchange" (Didn't verify any crack)
> 4. Where the furnace vent tied into the asbestos was very loose, there was
> a
> ½" gap all around it, looked like a good place for CO to get out. I sealed
> it real good at that point.
> 5. Gas Company came back and measured 0 PPM CO in crawl space. (NONE!) but
> then they measured 10 PPM in the house, and turned off the furnace.
> 6. I went on the roof to see if the chimney was clogged, and at 2' I hit
> something hard
> 7. I went in the attic and found the 2 right angles, and decided to go get
> drunk. (Just kidding about that last part.)
> (furnace is 18 years old but works)
> Asbestos and age aside;
> 1. Is it conventional or kosher to have a horizontal run in the flue vent
> for the furnace/water heater?
> 2. Where the chimney is flush with the roof, it's not sealed, should the
> chimney extend above the roof line?
> 3. Is there any kosher way to run the flue inside a wall nowadays?
> 4. I know I can vent a 90% or better furnace out the side with PVC, can I
> vent the water heater out the side, legally?
> 5. What am I forgetting?
>
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Posted by olaf on December 22, 2007, 6:01 pm
> Ooops, I forgot. You could also switch to electric for the hot water
heater
> if the house has 200 amp service. If it's still a 100 amp service that
> might not be an option.
I measure the current draw for my water heater at right around 16 amps. I
don't have any problems with my 100 amp service..... but my house isn't that
big.
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>My circa 1949 rental house an 18 year old furnace with a flue chimney which
>appears to be asbestos.
>It's gray and hard and flat about 3" x 15" and fits inside a wall. At some
>time it was moved, but not the whole thing, just the segment between the
>attic and the basement, to accomodate a wall move on the ground (only)
>floor. I guess they didn't want to re-do the roof so there's a "Z" in the
>attic, about 2' of horizontal run of same material, with glue and sheet
>metal at the two 90° joints. I think they also cut that horizontal piece out
>of the entire run of chimney, as it hangs from joists in the crawl space,
>and is flush with the roof deck on top.
>1. Tentant smelled gas in the room where the chimney runs up the wall.
>2. Gas Company measured some CO in the crawl space and made me shut off the
>furnace, saying "there might be a crack in the heat exchange"
>3. HVAC guy wants to sell me a new furnace, since "there might be a crack in
>the heat exchange" (Didn't verify any crack)
>4. Where the furnace vent tied into the asbestos was very loose, there was a
>½" gap all around it, looked like a good place for CO to get out. I sealed
>it real good at that point.
>5. Gas Company came back and measured 0 PPM CO in crawl space. (NONE!) but
>then they measured 10 PPM in the house, and turned off the furnace.
>6. I went on the roof to see if the chimney was clogged, and at 2' I hit
>something hard
>7. I went in the attic and found the 2 right angles, and decided to go get
>drunk. (Just kidding about that last part.)
>(furnace is 18 years old but works)
>Asbestos and age aside;
>1. Is it conventional or kosher to have a horizontal run in the flue vent
>for the furnace/water heater?
>2. Where the chimney is flush with the roof, it's not sealed, should the
>chimney extend above the roof line?
>3. Is there any kosher way to run the flue inside a wall nowadays?
>4. I know I can vent a 90% or better furnace out the side with PVC, can I
>vent the water heater out the side, legally?
>5. What am I forgetting?