Yankee Chronicler mentioned: The OP wrote that that is a large, multi-story assembly facility. He didn't say the quantity of tales or what the ground space of one other stories is, and that could make a difference. Yankee Chronicler said: A mezzanine must be in just a room or Room. https://trentonefvte.iyublog.com/37324429/not-known-facts-about-mezzanine-safety-gates-uk