Sucking or puffing of smoke from an open door or window is a warning for:

The phenomenon of sucking or puffing of smoke from an open door or window serves as a critical warning sign related to fire behavior, specifically indicating conditions that may lead to a backdraft. Backdraft occurs when there is a sudden influx of oxygen into a confined space filled with smoke and heated gases, often leading to an explosive ignition.

When a fire is burning in a structure, it consumes the available oxygen and creates a vacuum effect; this suction can draw smoke out of openings. If that vacuum is disrupted, such as by opening a door or window, fresh oxygen rushes in, which can ignite unburned gases and particles in a sudden and violent manner. This behavior is crucial for safety personnel to recognize, as it poses significant dangers to both firefighters and any occupants within the structure.

The other terms, while relevant to fire scenarios, do not accurately represent the specific danger associated with the smoking behavior described. Flame-over typically refers to flames spreading across the ceiling or tops of objects, explosive growth describes a rapid increase in fire intensity, and heat buildup indicates an accumulation of heat that can eventually lead to fire spread but does not specifically relate to the visible signs of smoke movement through openings.