What is the function of fire damper?

The purpose of a fire damper is to remain open under normal operating conditions, thereby allowing free flow and ventilation of air throughout the building. However, in the event of a fire, the damper is designed to close automatically, sealing the duct or opening and preventing the passage of fire, smoke and toxic gases. This helps contain the fire within its compartment and slows its spread to other areas of the building.

Fire dampers are usually constructed of refractory materials such as steel or aluminum and are tested and certified to meet a specific fire resistance rating. These ratings are based on the damper's ability to withstand exposure to fire for a certain period of time, such as 1 hour, 2 hours, or 3 hours.

Fire dampers can be activated by various mechanisms, including:

1. Thermal activation: Fire dampers can have a fuse or thermal element that releases at a specific temperature causing the fire damper blades to close.

2. Electrical activation: Some fire dampers can be activated by electrical control systems, triggered by smoke detectors or fire alarm systems.

3. Electric activation: Electric fire dampers use an electric motor or pneumatic actuator to close the fire damper after receiving a signal from the fire detection system.

Regular inspection, testing and maintenance of your fire damper is essential to keep it functioning properly. This includes checking for obstructions, proper closure and sealing, and verifying that the activation mechanism is working.

Fire dampers are an important part of a building's fire protection system, helping to protect occupants and property by preventing the spread of fire and smoke. Building codes and regulations often require them to be installed in ductwork and openings that require fire compartments.