What is a Type A fire damper?
Type-A Fire Damper: Used when the airflow interruption from the stack of blades in the fire damper frame is not a prime concern or consideration. Type-A dampers are the easiest and fastest type to install and are mostly used in low-pressure part of duct systems (up to 2” w.c.).
What is a fire damper and how does it work?
In general a fire damper works when heat from a fire causes the normal temperature of a room to rise to approximately 165 degrees Fahrenheit i.e. it is designed to close automatically on the detection of heat. The fusible link which is attached to the damper melts causing the dampers’ door to close.
How much is a fire damper?
The average cost of fire damper testing and inspections is between $40-$150 per fire damper.
What different types of fire dampers?
There are two main types of fire dampers: dynamic fire dampers and static fire dampers. Dynamic fire dampers have been UL tested to close against sys- tem air pressure and velocity.
What is the difference between fire damper and fire smoke damper?
A fire damper closes once the duct temperature reaches a high enough level to melt a fusible link. A smoke damper closes upon the detection of smoke. It is UL leakage-rated to stop smoke in its tracks, which is a main difference from fire dampers.
Where should a fire damper be placed?
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 is the difference between fire damper and smoke damper?
Where are fire dampers required?
Generally, fire dampers are required where air ducts penetrate walls that are rated for 2-hours or more. They are needed in all air transfer openings (non-ducted) in rated walls, regardless of the rating. And they are required at some, but not all penetrations of rated floor assemblies and shaft enclosures.
What are the three types of dampers?
Types of Dampers in HVAC
- Introduction to Different Types of Dampers.
- Butterfly Flat Dish Damper.
- Blade Dampers.
- Guillotine Dampers.
- Louver Dampers.
- Inlet Vane Dampers.
How long can a fire damper be used for?
The hour ratings for fire dampers must be 75% of the hour rating for the wall, floor or partition. That is why a fire damper rated for 1.5 hours can be used in a fire barrier rated for up to 2 hours and a fire damper rated for 3 hours can be used in a fire barrier rated up to four hours.
What’s the rating of a HVAC fire damper?
Fire dampers are UL 555 classified with a fire resistance rating of 1½ or 3 hours. Fire dampers fall into two categories: Dynamic rated – used with HVAC systems that remain operational during a fire emergency Static rated – used with HVAC systems that shut down automatically during a fire emergency
What kind of steel is a fire damper made of?
Fire damper sleeves are made of galvanized steel. Standard lengths for sleeves are 12”, 14” and 16”. Standard metal gauge sizes are 20 ga., 18 ga. and 16 ga. Sleeves shall be approximately 3” on either side of wall or floor to facilitate the joining of the sleeve to the duct.
When to use a type B fire damper?
TYPE-B FIRE DAMPER: The Type-B fire damper is generally used where the duct height is 12” or less and/or where air speed velocities are fast enough. It will be beneficial to have the blade stack out of the air stream. Having the blade stack out of the air stream maximizes free area and reduces the pressure drop.