What is the function of fire damper?

What is the function of fire damper?

The fire damper secures the integrity of the existing barrier thus preventing fire penetration before temperatures reach the fire rating level of the barrier itself. Its primary function is to prevent the passage of fire from one side to the other of a fire-rated separation.

What is fire damper in ship?

Marine fire dampers are used in air conditioning and ventilation ductwork onboard yachts, merchant ships, navy vessels and offshore rigs to prevent the spread of fire, smoke and gas inside the ductwork.

What activates a fire damper?

Fire Damper (FD) A fire damper is activated by heat from a fire inside the air duct. The heat can be detected by a fusible link, or by a heat detector in the air duct.

Where are fire dampers located?

Location: Fire dampers are installed in or near the wall or floor, at the point of duct penetration, to retain the integrity and fire rating of a wall or floor whether it is a ducted or open-ple- num return application.

What are the six 6 types of damper?

6 Types of Industrial Dampers and When to Use Them

  • Multi-Blade Control Dampers. VC-400 series opposed and parallel.
  • Single Blade Dampers. VC-56 ISO damper.
  • Backdraft and Pressure-Relief Dampers. PR-13 Pressure Relief Damper and BD-56 Backdraft Damper.
  • Face and Bypass Dampers. Bypass Damper.
  • Inlet Vane Dampers.
  • Isolation Dampers.

How are dampers controlled?

Manual dampers are turned by a handle on the outside of a duct. Automatic dampers are used to regulate airflow constantly and are operated by electric or pneumatic motors, in turn controlled by a thermostat or building automation system.

Where are dampers located?

Typically in most homes, your HVAC dampers are located in the main supply trunks. The supply trunks are the parts of the ductwork that are blowing warm air or cold air depending on the season.

Is a fire damper required in a 1 hour wall?

Q: Are fire dampers required in one-hour fire-rated walls if the facility is fully sprinkled? A: According to NFPA 90A (1999 edition), one-hour fire-rated barriers do not require fire dampers in fully ducted HVAC systems, unless the one-hour fire-rated barrier is a vertical shaft.

Where should fire dampers be installed?

Are fire dampers normally open or closed?

Fire dampers normally close when the temperature of the fusible link reaches 165˚F, although some local variations exist. For example, if steam coils are present in ducts, use of a 212˚F high limit may be used.

What is an ISO damper?

VC-56 ISO damper. Single blade dampers are often referred to as butterfly dampers or wafer dampers. These dampers can be supplied in round, square, or rectangular varieties. The blades can be of a single thickness or double skin airfoil design.

What is a fire damper used for?

Fire dampers are tested and listed for use in air-conditioning and ventilating ducts by UL in accordance with UL 555, Fire Dampers. These dampers include single-blade, multiblade, and interlocking-blade types, all actuated by fusible links.

What is a fusible link fire damper?

A fusible link fire damper is a style of fire damper or smoke damper. While automated systems or smoke alarms control some dampers, a fusible link fire damper is controlled by the fire itself. The fusible link is sensitive to high temperatures and remains open until exposed to high heat, such as that from a fire.

What is a fan damper on a door?

These dampers are constructed as vertical barriers and feature a spring-loaded design and continuous fan use. The air pressure produced by the fan helps to activate the door’s spring loaded system, causing it to shut quickly and allowing the fan to remain in use.

Where is the damper on a chimney?

A damper located at the base of a chimney, just inside the top of the fireplace A damper may sometimes be located at the very top of your chimney, known as top-mounted damper or a top-sealing chimney damper cap.