How do you size a fire damper?
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 is a Type B fire damper?
Type-B Fire Damper: Used when airflow or velocity in the duct is a concern. The stack of blades in the fire damper frame is kept out of the air stream. Compared to an Type-A damper, the total square inches of free area in a Type-B damper is increased and the pressure drop is reduced.
Where should fire dampers 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 a curtain fire damper?
The 0160 series curtain fire dampers are designed to stop the spread of fire through ductwork, walls and floors in ventilation systems. When the fusible link reaches elevated temperature, it releases interlocking blades closing the damper by locking into the blade ramp sealing the damper closed.
Are fire dampers directional?
the damper is facing the wrong way for the airflow direction – if the HVAC system fan will continue to operate during a fire, then positioning the damper correctly in relation to the airflow means that the air pressure will help the damper to close and to stay closed; put it in the opposite way round and the opposite …
What different types of fire dampers?
There are four types of life safety dampers: fire dampers, smoke dampers, combination fire-smoke dampers, and ceiling radiation dampers. Buildings will require life safety dampers in specific areas, such a fire barriers, to create special zones for fire and smoke containment.
How many types of fire dampers are there?
No, there are 2 types of dampers, either mechanical or intumescent. Mechanical dampers dependant upon the application they can be “drop type” curtain (most common), single or multi blade . There are different fire dampers for horizontal or vertical installation.
Are fire dampers required in 30 minute walls?
Ductwork passing through compartment and sub-compartment walls should be provided with fire dampers. Where a duct passes through a fire hazard room, but does not serve it, fire dampers are not required but the duct must have fire resistance of 30 minutes in respect to integrity and insulation.
Should fire dampers be open or closed?
A fireplace damper should always be kept open while the fire is burning. By leaving the damper open, heat is being lost as warm air is being pulled through a hole in your living room (the chimney) all the way up and through the roof. Pay close attention to the damper position, it’s very important.
What are volume control dampers?
The Volume Control Damper is used to control air flow in air duct. This unit comes with complete manual quadrant or motorized actuators. The Volume control dampers help to adjust the air flow volume to the other parts of this duct system. These dampers can be fixed within the duct itself and can be automatic or manual.
What are fire dampers used for?
Fire Dampers are used in air transfer openings, ducts and other places where fire rated structures (e.g. walls, floors or other fire barriers) are penetrated.
Can a fire damper be installed upside down?
the damper is the wrong size – even if it operates correctly, if it doesn’t fill the duct space, it won’t contain the fire. the damper has been installed upside down – if that’s the case, then gravity will work against it and it won’t close.