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Old 01-10-2008, 06:13 PM   #1
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Below grade fireplace venting


I'm adding a small gas fireplace as part of a basement remodel. The rim joist is only several inches above grade so I'd either need to:

1) vent parallel to the floor joists - through the rim - and periscope up to meet the 12" above grade requirement

or

2) vent perpendicular to the joists - pass through the 8" foundation wall - and periscope up through the grade

I prefer the resulting vent location of option 2, but I'm not sure of the best way to cut a round hole in the cement wall. I also wonder how the vent seals to the wall to prevent water penetration.

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Old 01-11-2008, 04:33 PM   #2
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Below grade fireplace venting


You need to make sure the unit you want to use can be vented that way. Most of the new units I have installed have very specific vents that can't be elbowed. They have been double wall pipe that has to go straight out the rear wall. Have you looked into vent free units?

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Old 01-13-2008, 09:14 AM   #3
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Below grade fireplace venting


a vent free fireplace is never a good option because they will kill someone and have did so in many cases already

there are many different fireplaces out there that you can use a periscope vent termination with and they work great, i install these on a weekly basis

the only thing you need to remeber is that if the hole coming out is below grade you will need to dig a well similar to a window well of a basement and about two feet deep and then below that two feet go down another foot and back fill with gravel, then use sheet metal to make the well around your periscope

napoleon makes a periscope vent termination for pretty much all of there fireplaces and regency makes them as well, but the napoleon ones look much better on the outside of your house

but if i were you i would never in my life put a vent free in, they are banned in canada for a reason
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Old 01-13-2008, 08:33 PM   #4
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Below grade fireplace venting


It sounds like you have a good handle on the situation. It comes down to how much work you want to do. As suggested, make sure you meet the requirements of the fireplace with the venting (bends, length, etc) and that your periscope is what youneed for your required pipe style.

last one I did I got lucky and had a window opening I could use and still beat the 12" requirement by an inch or so.

Consider not only how it will look on the outside but on the inside. Mine was a stove style and the pipe visible in the room. A long horizontal run would have looked awkward.

If inside isn't a concern for you, your preferred outside location will satisfy the requirements of your fireplace, piping and periscope then thats what I would do. Put it where you will like it best. If that means cutting a hole in your foundation wall then go for it. Its a lot of work to DIY but it can be done. If you don't have the right tools it might be best to hire it out. But hey, who isn't looking for an excuse for a new tool?
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Old 01-13-2008, 10:57 PM   #5
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Quote:
Originally Posted by mgv79 View Post
a vent free fireplace is never a good option because they will kill someone and have did so in many cases already

there are many different fireplaces out there that you can use a periscope vent termination with and they work great, i install these on a weekly basis

the only thing you need to remeber is that if the hole coming out is below grade you will need to dig a well similar to a window well of a basement and about two feet deep and then below that two feet go down another foot and back fill with gravel, then use sheet metal to make the well around your periscope

napoleon makes a periscope vent termination for pretty much all of there fireplaces and regency makes them as well, but the napoleon ones look much better on the outside of your house

but if i were you i would never in my life put a vent free in, they are banned in canada for a reason
Ever hear of an oxygen depletion sensor?
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Old 01-14-2008, 06:34 PM   #6
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Below grade fireplace venting


there is only one place for vent free fireplaces and that is outside or on a sun porch which is well ventilated not in your basement, if they were safe then more ppl would use them

you see here in canada we pride ourselves that we dont want to blow ourselves up and that is why we have the strictest gas codes in the north america and it is pretty much illegal to touch gas applicances unless you are licensed

so i guess if you want to cheap out and just put a vent free one in then go ahead and do it but plz for the love of god use an oxygen depletion sensor, and if you dont know what it is then call someone who knows what they are doing
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Old 01-15-2008, 07:27 AM   #7
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Below grade fireplace venting


Nothing burns 100%. Vent free units are against code here and alot of other places. A vent free will also add alot of moisture to the room it serves. Even with a sensor I would never put one in my house.

As for the original question, follow the manufactures instructions on weather it can be done with the unit you have or not. I did the same thing in my house and had to get creative on how to mount the cap to the wall because they didn't make one at that time. A few calls to the manufacturer and we got it figured out.
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Old 01-15-2008, 07:20 PM   #8
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Below grade fireplace venting


you hit the nail on the head Hvac, and i know for a fact that napoleon has a vent termination that will take care of the exact problem he is having, i we put them in on a weekly basis and have many happy customers

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