1.Rectangular fire dampers have a fusible link that triggers above a specific temperature and closes shut using spring-loaded blades or gates. They eliminate the spread of fire through the HVAC systems.

2.The main function of a fire damper is to maintain compartmentalization in a building, which is necessary to limit the spread of fire and provide occupants with safe egress routes. Fire dampers are typically installed in ductwork, ventilation openings, or fire-rated walls and floors.

3.Fire dampers are usually classified based on their fire-resistance rating, which indicates their ability to withstand heat and flames for a specific duration.

4.Common fire-resistance ratings include 1 hour, 2 hours, and 3 hours. It is important to ensure that fire dampers are installed, tested, and maintained according to local building codes and regulations.

5.Regular inspection and maintenance of fire dampers are essential to ensure their proper functioning. This includes checking for any obstructions, testing the operation of the damper, and verifying that the fusible link or thermal element is in working condition.