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Old 03-17-2013, 06:57 PM   #16
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Exhaust of furnace and hot water heater


Right now it vents up the chimney, so why can't I just let it vent directly out the side of the wall? What do all these "power vents" do? The pipe is facing toward the rear of the house where there is about a four foot space before the next persons property starts. It is fenced in and no one ever goes there. There really is no "back yard" on this property.

One person said it may not vent. I do not understand how that can be since now it is venting up the chimney.

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Old 03-17-2013, 07:00 PM   #17
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Exhaust of furnace and hot water heater


Power vents, push the air down the pipe, to help exhaust the gasses from the burning of the fuel. Items like Power vent water heaters, unless they are LoNx, are still going to be hot exhaust coming out at the end. Manufacturer directions for the power vent, will tell you how and where you can vent the units.
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Old 03-17-2013, 07:48 PM   #18
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Exhaust of furnace and hot water heater


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Originally Posted by crescere View Post
Right now it vents up the chimney, so why can't I just let it vent directly out the side of the wall? What do all these "power vents" do? The pipe is facing toward the rear of the house where there is about a four foot space before the next persons property starts. It is fenced in and no one ever goes there. There really is no "back yard" on this property.

One person said it may not vent. I do not understand how that can be since now it is venting up the chimney.
Your furnace is a negative draft appliance. Meaning it needs to have the flue gasses pulled a way from it. So a power ventor is needed at the wall. Because its inducer is not a blower.
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Old 03-17-2013, 08:37 PM   #19
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Exhaust of furnace and hot water heater


Dont I have a power vent there already to send it up the chimney?
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Old 03-17-2013, 08:39 PM   #20
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Exhaust of furnace and hot water heater


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Dont I have a power vent there already to send it up the chimney?
It depends on what kind of furnace and/or water heater you have installed. Might want to check that out visually, instead of just going back and forth on here wondering.
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Old 03-17-2013, 08:54 PM   #21
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Dont I have a power vent there already to send it up the chimney?
No. If you did, you would see it as an external device to both the water heater and furnace.
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Old 03-17-2013, 10:02 PM   #22
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Exhaust of furnace and hot water heater


Here's an example of what a power vent for a side wall furnace termination looks like. Well the link didn't work. Google field controls swg power vent
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Old 03-17-2013, 10:28 PM   #23
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Here's an example of what a power vent for a side wall furnace termination looks like. Well the link didn't work. Google field controls swg power vent


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Old 03-17-2013, 10:32 PM   #24
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Exhaust of furnace and hot water heater


Nice little snow melter there. Even better if someone has a Pellet stove I bet.
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Old 03-18-2013, 07:11 AM   #25
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Exhaust of furnace and hot water heater


I would really try to have the chimney repaired above the roof as long as it's not going to collapse.
Then install a chimney liner. Hard to tell without anymore knowledge or images.
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Old 03-18-2013, 10:54 AM   #26
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Exhaust of furnace and hot water heater


I agree with COLDIRON as the no brainer solution, given the info you've supplied.

Last edited by how; 03-18-2013 at 11:20 AM.
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Old 03-18-2013, 11:57 AM   #27
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Exhaust of furnace and hot water heater


Brick is falling off the chimney above and below the roof. One estimate I had was $1200.00 to fix the masonry.

So what is the concern here? Is it that the exhaust is too hot and anyone walking by may get burned if I vent it out the wall? The chimney is in the back of the house where no one goes.
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Old 03-18-2013, 01:07 PM   #28
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Exhaust of furnace and hot water heater


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Brick is falling off the chimney above and below the roof. One estimate I had was $1200.00 to fix the masonry.

So what is the concern here? Is it that the exhaust is too hot and anyone walking by may get burned if I vent it out the wall? The chimney is in the back of the house where no one goes.
The concern is if it will vent properly & not back flue gasses into your house. Water heaters that vent through the ceiling work becuase the flue is carried up because of the heat of the flue gasses. Hot air rises, so the hot flue gas rises out of your flue. If you run it sideways it won't vent, it has to be pushed out by a vent motor because it will only move up by itself.

They make specific water heaters for sidewall venting, they have a blower on top of the heater that pushes flue gas out. If your water heater doesn't have a blower on top it either has to vent up or you have to add a motor outside to pull it out as pictured above. Failure to do so will almost surely result in flue gasses and possibly carbon monoxide backing up into the house.
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Old 03-18-2013, 03:17 PM   #29
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Exhaust of furnace and hot water heater


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The concern is if it will vent properly & not back flue gasses into your house. Water heaters that vent through the ceiling work becuase the flue is carried up because of the heat of the flue gasses. Hot air rises, so the hot flue gas rises out of your flue.

Thank you, now I understand. Is the same true of the furnace?
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Old 03-18-2013, 06:02 PM   #30
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Exhaust of furnace and hot water heater


Yes. The inducer motor on a 80% furnace only sucks air into the heat exchanger for combustion but the flue is still a negative pressure.

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