John Molyneux
Member
Dear experts: Now that you guys (well, Dana in this case) have helped me figure out heat loss and boiler size I have a venting question. I won't be able to use the location of my existing sidewall vent for the new boiler since we're putting in a screen porch and deck in that area. I have differing opinions from contractors and manufacturers about the best alternative.
Our preference would be to go up the chimney and use either of the two currently unused flues as a chase. The other flue, however, sees regular fireplace use. Could there be temperature problems, e.g. too hot to use an adjacent flue as a chase? Is there a work-around that makes sense?
I'm also wondering if there might be a problem with the intake air picking up fireplace combustion byproducts. If that's the case, is it OK to draw intake from sidewall and vent through chimney, in which case they would be different lengths?
An alternative would be to exit at the existing location and then run it vertically up the sidewall until we get enough height, consistent with other code offsets, etc. Would there be any temperature or other issues running 10-15 feet of exposed exhaust vent up an outside wall? (Design day temp is +2F.)
Another alternative would be to run it up inside the outside wall, which could be a PITA.
Thanks in advance.
Our preference would be to go up the chimney and use either of the two currently unused flues as a chase. The other flue, however, sees regular fireplace use. Could there be temperature problems, e.g. too hot to use an adjacent flue as a chase? Is there a work-around that makes sense?
I'm also wondering if there might be a problem with the intake air picking up fireplace combustion byproducts. If that's the case, is it OK to draw intake from sidewall and vent through chimney, in which case they would be different lengths?
An alternative would be to exit at the existing location and then run it vertically up the sidewall until we get enough height, consistent with other code offsets, etc. Would there be any temperature or other issues running 10-15 feet of exposed exhaust vent up an outside wall? (Design day temp is +2F.)
Another alternative would be to run it up inside the outside wall, which could be a PITA.
Thanks in advance.