I have purchased an englander free standing stove and some simpson pipe to install in my workshop. I have a 30x50 steel framed shop. There is no rafters in the shop. Im looking over these diagrams of installing the pipe through the ceiling and I see this support box. I dont know if I need that to do this job. I dont even have any wood in the ceiling to attach such a box to. If its necessary I place it there I will have to frame some type of structure for it to attach. My cealing consists of insulation and then the corrugated roof. If someone has a reccomendation of what I need to do that would be helpful.