Where must fire and smoke dampers be installed?

Fire and smoke dampers are critical components in HVAC systems designed to protect against the spread of fire and smoke through air distribution systems. Their installation is specifically required in fire rated walls that have been penetrated. Fire rated walls are constructed to resist the spread of fire and must maintain this integrity. When an HVAC duct or any other penetration occurs through such a wall, it compromises the wall's fire-resistance rating. By installing fire and smoke dampers, the barrier is restored, allowing for the necessary airflow while ensuring that fire and smoke do not travel through the ducts from one side of the wall to the other.

This requirement is based on building codes and standards, which specify the appropriate locations for such dampers to effectively minimize hazards. Therefore, the correct placement of fire and smoke dampers is essential to maintain the safety and integrity of the overall building fire protection system.