The figure phone calls it an imaginary line, but it's not imaginary. It really is only "imaginary" with respect to getting lots line, as it's not lots line. But the gap that decides exterior wall fireplace-resistance ratings and allowable opening percentages is predicated on the space to this line, as https://ibccontainerzubehor90122.losblogos.com/36580670/detailed-notes-on-ibc-container-gebraucht