Fire travel Fire will always follow the path of least resistance, moving from high pressure to low pressure in search of oxygen. Traditional flow path studies and videos give us a good idea of how fire moves through buildings, but there’s a problem with them. They often don’t account for open ceilings, which are commonly found in vacant and lower-income dwellings. Lath and plaster ceilings will deteriorate and fall if not maintained. A cheap, simple fix is a drop ceiling—often poorly installed a