Why is a transition duct that penetrates a floor, wall, or ceiling considered a fire hazard?

A transition duct that penetrates a floor, wall, or ceiling is considered a fire hazard primarily due to the potential for improper installation. When ducts are not installed correctly, they can create gaps or weaknesses in fire barriers that are intended to restrict the spread of smoke and flames. Fire can easily travel through these penetrations if appropriate fire-stopping materials are not used or if the ducts do not comply with building codes and safety standards.

In certain buildings, ducts that pass through fire-rated assemblies must be sealed properly to maintain the integrity of those assemblies. If this is neglected, the risk increases significantly as fire and smoke can move between different sections of the building, endangering occupant safety and undermining the overall fire protection strategy.

The other options do not accurately depict the reason why transition ducts might be a fire hazard. For instance, allowing air to escape outside does not contribute to fire risk; rather, it could potentially compromise energy efficiency. Similarly, improving structural integrity or preventing overheating are not relevant concerns when discussing the hazards associated with the installation of transition ducts.