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  1. #11
    Join Date
    Nov 2012
    Location
    central pa
    Posts
    98

    Default Re: Fireplace Problems

    I just read that you fire place is vented out the side if that is true it should never be used for wood there are no ul listed direct vent wood fireplaces on the market and it would be very unsafe. my guess with out seeing it is that that box is for the air intake and the flue exits through the top of the chase but I have also seen builder do some crazy stuff so who knows. also this type of fire place will never make much of any usuable heat at all just about all fireplaces send more heat and heated air from inside the house up the flue than they produce if you are near the fire place you will feel radiant heat from it but in the mean time it will be pulling heated air from else where in the house and sending it up the flue. this is true regardless of the fuel used.
    Last edited by junkout; 10-01-2013 at 05:40 PM.

  2. #12
    Join Date
    Sep 2013
    Posts
    14

    Default Re: Fireplace Problems

    Thanks for the info. Attached are the operation and install manuals for our fireplace:

    http://www.lennoxhearthproducts.com/...on_725041M.pdf

    http://www.lennoxhearthproducts.com/...on_700026M.pdf

    http://www.lennoxhearthproducts.com/...ifications.pdf

    Our fireplace has a regular chimney with an air combustion kit installed. From what I understand, the air combustion kit draws outside air to fuel the fire and then the smoke exits through the chimney. The fireplace was originally set up to burn wood when we moved in (we converted it to gas logs before we ever used wood) and I was told by Lennox that it can be used for wood. Ideally we want to get an insert but right now it's not feasible financially. So we're trying to squeeze as much efficiency out of what we have.

    I was told by someone else that I should insulate around the box and the chase and it also mentions it in the install instructions. I believe I read that all insulation must be 1" away from the box but maybe I misread. It was also recommended that I create a horizontal "box" of 2x4s around the chimney pipe just above the box (like 6 to 8' high). I would cover this with plywood or drywall (maintaining at least a 1" gap around the pipe) creating a deck. The the entire deck would be insulated with unfaced insulation to within 2" of the venting. Aluminum tape would be used to seal the firestop to the venting.

    I also found the following article on outside air combustion.....any thoughts?
    http://woodheat.org/the-outdoor-air-myth-exposed.html

  3. #13
    Join Date
    Nov 2012
    Location
    central pa
    Posts
    98

    Default Re: Fireplace Problems

    you are right according to that you have a 1" clearance to combustibles. and it doesn't say that you cant insulate so that should be fine. you keep mentioning an insert. are you planning on putting an insert in this unit? if so you could potentially be seriously compromising your safety. at the least if your insurance company finds out they will drop you in a second. there is only one prefab fire place that is ul lised to have one specific insert put in it and your fire place it not that one so there is no way that you can have an insert put in that will meet code.

  4. #14
    Join Date
    Jan 2008
    Posts
    2,203

    Default Re: Fireplace Problems

    Around here, any insulation that contacts a combustion vent can only be rock wool- they will fail an inspection here if it's fiberglass, even unfaced. All the inspectors I have asked said the only other acceptable alternative would be to fire-caulk the space which would be very cost-prohibitive. Prepare to itch!

    Phil

  5. #15
    Join Date
    Nov 2012
    Location
    central pa
    Posts
    98

    Default Re: Fireplace Problems

    no insulation should contact this vent it calls for a 1" air space doesn't matter if it is combustible or not

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