Rectangular fire dampers

Understanding the Functionality of Rectangular Fire Dampers for Enhanced Fire Safety

Introduction: Fire safety is of utmost importance in any building or structure, especially when it comes to preventing the spread of fire. One crucial component in maintaining fire resistance within ductwork is the rectangular fire damper. In this article, we will explore the working mechanism of a rectangular fire damper and its vital role in preserving fire-resistance ratings.

What is a rectangular Fire Damper? A rectangular fire damper is a specialized device designed to impede the propagation of fire through ductwork that passes through fire-resistance rated walls and floors. By effectively sealing off the ducts, these dampers act as a barrier, preventing the fire from spreading further.

Working Principle: During normal operation of the ventilation system, the fire damper blade remains open, allowing air to flow freely. However, in the event of a fire, the fire damper springs into action to limit the fire’s progress. This is achieved through an automatic closing mechanism triggered by a fusible link.

Temperature Sensing and Activation: When the temperature within the duct exceeds a predetermined threshold, typically around 72°C, the fusible link is activated. This causes the fire damper blades to swiftly close, effectively sealing off the duct and obstructing the fire’s path. By promptly responding to high temperatures, round fire dampers play a critical role in preventing the fire from spreading to other areas.

1. The ventilation system is working and the fire damper is open.

2. A fire breaks out and the temperature reaches 72°C: the fusible link melts and the damper blade closes.

3. The intumescent material expands to create a seal that stops flames and smoke.

Remote Control and Motorized Models: In certain scenarios, remote-controlled and motorized rectangular fire dampers offer enhanced functionality and flexibility. These advanced models can also close upon receiving a signal from a fire safety system, such as an activation trigger from a smoke detector. By integrating with such systems, rectangular fire dampers ensure a rapid and coordinated response to potential fire hazards.

Maintenance of Compartmentation: When the rectangular fire damper is closed, it serves a crucial purpose: maintaining compartmentation. Compartmentation refers to the division of a building into separate compartments, each with its own fire resistance rating. By sealing off the ductwork, the fire damper helps sustain the integrity of these compartments, containing the fire within a designated area for a specified period.

Conclusion: Rectangular fire dampers are indispensable components for fire safety in buildings. By effectively sealing off ductwork, they prevent the spread of fire and maintain compartmentation, thereby providing essential protection against fire hazards. With their automatic closing mechanism and compatibility with fire safety systems, these dampers ensure a swift response to high temperatures or activation triggers. By understanding how rectangular fire dampers work and their vital role in fire prevention, building owners and occupants can prioritize fire safety and enhance the overall protection of their premises.