Hinged door dampers are used where a ______ hour fire rating is required.

Hinged door dampers are specifically designed to control the spread of fire and smoke within a building, and they play a crucial role in fire containment strategies. The requirement for a 3-hour fire rating indicates that these dampers can withstand fire exposure for an extended period, preventing the passage of flames and hot gases. This capability is vital in maintaining the integrity of fire-rated assemblies and ensuring safe evacuation routes during a fire incident.

The 3-hour rating is generally associated with more critical areas in a building, such as between different occupancy types or within areas where a higher risk is identified. This level of protection is essential in ensuring that fire does not compromise life safety or property, aligning with building codes and safety standards that dictate how long fire protective measures must be operational in case of an emergency. The options for 2-hour, 4-hour, and 5-hour ratings do not fit the specific requirements for hinged door dampers, as those ratings typically correspond to other types of fire protection systems or applications used in different contexts.