That's from the PE Super's listing label:
"INSTALL AND USE ONLY IN MASONRY OR FACTORY BUILT FIREPLACE."
Apparently you don't trust the testing procedure from ANY insert manufacturer that allows installation of their units into a ZC fireplace? I am pretty sure those testings have to be done from independent labs and I doubt that manufacturers can really just write what they want on that label then.
"INSTALL AND USE ONLY IN MASONRY OR FACTORY BUILT FIREPLACE."
Apparently you don't trust the testing procedure from ANY insert manufacturer that allows installation of their units into a ZC fireplace? I am pretty sure those testings have to be done from independent labs and I doubt that manufacturers can really just write what they want on that label then.