I have been running a chimney that violates 3-2-10 for a pretty long time. I got a way with it for 5 months less than a pretty long time.
I think overall the 'rule of thumb' is overkill', but if you are having draft issues, even intermittent ones, it is a good place to start and proceed from.
Here is my old ZC fireplace, a heatilator:
Notice this was back in the day of CRT type televisions, and I have a plastic curtain already attached to the ceiling and a scrap of carpet padding on the floor for upcoming demolition. I have also retired the 3/8" chuck drill since this picture was taken...
And here, you may judge by the ankle - happy wife, happy life - after I removed the ZC and put in an EPA cert non cat - in 2013.
Here is a chimney shot of the first burn in the EPA cert non cat before I had to go do man stuff with the wife in front of the stove....
According to my records this was 11-10-2013.
I think overall the 'rule of thumb' is overkill', but if you are having draft issues, even intermittent ones, it is a good place to start and proceed from.
Here is my old ZC fireplace, a heatilator:
Notice this was back in the day of CRT type televisions, and I have a plastic curtain already attached to the ceiling and a scrap of carpet padding on the floor for upcoming demolition. I have also retired the 3/8" chuck drill since this picture was taken...
And here, you may judge by the ankle - happy wife, happy life - after I removed the ZC and put in an EPA cert non cat - in 2013.
Here is a chimney shot of the first burn in the EPA cert non cat before I had to go do man stuff with the wife in front of the stove....
According to my records this was 11-10-2013.
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