The figure phone calls it an imaginary line, but it's actually not imaginary. It really is only "imaginary" with regard to being a lot line, as it's not quite a bit line. But the gap that establishes exterior wall fire-resistance ratings and allowable opening percentages is predicated on the gap https://seecontainerkaufen92579.blog2learn.com/83909762/the-smart-trick-of-ibc-container-zubehor-that-nobody-is-discussing