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Old 01-14-2009, 07:30 PM   #1
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Sorry I didn't realize you should check back in 1 hour. Thanks for the help yesterday. I won't vent it through the front. I'll go to the back, maybe 18', and run up high in between 2 joists. I go through a basement room with a drywall ceiling, but it's already ripped out here cause they had to get all the copper. When you buy a bank home with no plumbing left you can afford to take a little longer to put the furnace in, even though it's 8 deg in Cleveland now. I can get the 1/4" per ft slope I think. I bought a Concorde furnace, made by Allied Air Ent., a Lennox Co. The old Corovaine furnace had a flue in the back with a 23 X 8 stack across the front. My plumbing supplier made a nice piece to make the 15 X 22 work, but I had to still "fabricate" like hell. The point is I had 3'' over the top to the joist so the 2" vent pipes fit over but there isn't enough slope to go 14' across the joists and under them to driveway side. The concentric is over 2' long 3.5" diam. with a Y to vents. This takes out 2 joists across them. And finally to get out the wall you have to go through the wall joist, and bore a 3.5" hole in it. Either that or go lower through the block, or higher and you have to cut up into the subfloor, right?

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Old 01-14-2009, 08:12 PM   #2
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If you have room you can run one pipe below the other. Just a thought.

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Old 01-14-2009, 08:24 PM   #3
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Thanks, I'm going to look at someone's 90 now.
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Old 01-14-2009, 08:36 PM   #4
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You don't have to use a concentric kit. You can terminate them side by side. Should have that info in the install instructions. You can also go vertical thru an unused chimney if you have an electric water heater and don't need a chimney.
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Old 01-14-2009, 09:48 PM   #5
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be sure to support the exhaust pipe I like to put hangers every three feet if I can it is over kill but in the old days made the mistake of using too few and paid the price. over time the pipe will sag and hold water.
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Old 01-14-2009, 10:30 PM   #6
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Yeah I just seen an Armstrong 90. Each vent uses (4) 90's and a 45. They go right together about 14 feet across and under the joists and then go up and to the right into the joist channel with a 45 and 90 and then 4 feet to and thru the "wall" joist. Two separate 2" holes close and parallel in the middle of the joist. There is no concentric. At the furnace they are 6'4" up, 7" under the 7' high joist, and slope up to 6'8", 3" under the 7' high joist at the bend. Talking about using the chimney, I saw elsewhere where someone recommended to someone to get a high efficiency water heater also and then running 4 vents up the chimney, but that's beyond my skills.
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Old 01-14-2009, 10:44 PM   #7
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Where is your furnace that you can't just go right out the side of the wall to either the back, or side of the house....
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Old 01-14-2009, 11:09 PM   #8
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The furnace is near the front of the house facing the neighbor's side. So to go to my driveway side, I have to go behind the furnace and there is a mountain of ductwork blocking things. I would have to go around all this before I go go up high. It's possible with alot of 90's. To go to the back of the house I have to pass in the joist area above the dividing wall of the front and back basement areas and continue thru 10' more before going out the joist (wall). But this back room has a drywall ceiling except for the one section between 2 joists where copper was ripped out. This is the section I would use but then I couldn't ever cover this with drywall, right?
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Old 01-15-2009, 08:21 AM   #9
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How far to neighbors, does your municipality dis-allow this? Have you talked to the neighbors? I vent right out my wall pointing towards neighbors house, 12 feet away.
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Old 01-15-2009, 12:26 PM   #10
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The neighbor's side is about a 12 ft run across the joists. But these small bungalo's are squeezed together so their drive is like 2 feet from my exterior wall. I'll find out what's allowed when my job gets inspected. I'm pretty happy with my plan to go out to the back. This is with the joists and that concentric is 34" long, so if it sticks out 8" I still have 26" inside, and this is fine between the joists but a pain to cut through 2 joists going across them. Thanks, it just took a long time to decide which way to go. If I got to change it, a hole in the back is easier to fix up.
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Old 01-15-2009, 06:23 PM   #11
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Can't imagine exactly what you are doing but be careful not to cut thru any load bearing or structural joists so you don't cause any structural problems. I don't like concentric kits as the intake can easily plug with snow/spider webs and you really need to keep that clear.
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Old 01-15-2009, 08:56 PM   #12
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as mentioned cutting joists is a big no no ok if your drilling a hole for a 3/4 piece of copper but a 3 in flue def not, it will fail insp big time

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