What is necessary if ducts penetrate fire-rated assemblies?

The correct answer is that the use of galvanized steel or aluminum is necessary when ducts penetrate fire-rated assemblies. Fire-rated assemblies are designed to prevent the spread of fire and smoke between different areas of a building. When ducts pass through these assemblies, it is crucial to ensure that they are made from materials that can maintain the integrity of the fire barrier.

Galvanized steel and aluminum are commonly used in ductwork because they are non-combustible materials that can withstand high temperatures and help prevent the passage of flames and smoke. In addition to choosing the right material, proper installation techniques must also be followed to ensure that the fire-rated assembly’s performance is not compromised.

Using combustible materials for ducts in fire-rated areas would violate fire safety regulations and could lead to dangerous situations in the event of a fire, as these materials could contribute to the rapid spread of flames and smoke. Therefore, adherence to the use of appropriate materials is vital for maintaining the safety and compliance of fire-rated assemblies.