I assume once the insert is installed, the effective firebox opening is reduced to that of the insert, in which case 16" would easily meet code. When...
As of 2007, this says 16" for firebox opening <6 sq ft, 20" if firebox >6 sq ft. http://www.mass.gov/eopss/docs/dps/780-cmr/780060.pdf
Justin, if you haven't yet, you're probably better off buying in tax-free NH, but I noticed yesterday the stove place on Rt 20 in Shrewsbury has the...
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