I have a question related to hyperbaric chambers (type 2). I have a physician's office that has installed a single hyperbaric chamber (type 2) in a wound care setting on the ground floor of his practice. This current unit is supplied through (4) H cylinders located on a adjacent wall. There is a natural gas fired fireplace located across the room about 20' from the current chamber and the physician wants to add a second chamber and four additional (H) cylinders to supply the new chamber. What code sections should I be looking at related to this installation? It would seem to me that the fireplace installation even if code compliant is not a good practice when the chambers are depressurized. Thanks for your input.