So I went back and looked at when I got my first mechanical license. It was February of 1988. Back then NFPA 211 did not allow a solid fuel appliance in a garage. What changed? Please cite which part of the NFPA 211 defines a garage. Michigan inspectors mean nothing to me in the Pacific Northwest.
You say this "Back then NFPA 211 did not allow a solid fuel appliance
in a garage" then this "Please cite
which part of the NFPA 211
defines a garage". Not trying to argue or start a fight, just that it's contradictory
Code 211 section 13.2.3 states "Solid fuel-burning appliances shall not be installed in any location where gasoline or any other flammable vapors or gasses are present"
Code 211 section 13.2.4 states "Solid fuel-burning appliances shall not be installed in any garage"
I think those 2 are self explanatory and ones that all inspectors typically use, but for argument sake let's look at the Merriam-webster dictionary for the definition of a "garage" : " 1- a building or part of a building in which a car, truck, etc., is kept.
2- a shop where vehicles are repaired"
section 13.2.3 can also apply to a paint shop, woodshop (think wood dust, stain/varnish), welding shop (though there are flames there already so,.... ?) etc, etc. Now, I do not know nor can I find the year that 13.2.3 & .4 were added into the NFPA section 211. but they are the last addendums.
The NFPA does not make laws but provides codes and standards on which local and state governments can build their codes from. just because the NFPA has a code or standard for a particular situation does not mean it's a law in your area. BUT they outline great and safe practices to follow !
Here is the link to the free access of NFPA codes/standards.
http://www.nfpa.org/codes-and-standards/resources/free-access
Looking back in my notes I see that I somewhat misspoke. I was told by our state inspector in Lansing, (not some local guy) that this chapter was
adopted into MI state building code effective Jan-1 2010 and that my installation was grandfathered in. So,..... I was conveying what I was told by "the man" but recalled it incorrectly. Sorry for missing that detail
As for Michigan inspectors, the O.P. is in Michigan so what rules/laws are in place here matters very much to him, if not to you.
Edit....
I also see in my notes that if the appliance is totally quarantined off and the only access to it, plus combustion air, is from an exterior entrance to said "garage", the appliance can be used. basically, build a sealed room inside your garage with the only acces from outside. this obviously doesn't work for a radiant heater. And again, this may only be a Michigan thing as I could not find it in the NFPA codes