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 C fire damper?
Standard Profile Fire Damper – 4¼” 22Ga 1 Piece Rollformed Frame. Dynamic for Installation in Systems Where Fans Remain Running During Fire and Smoke Control. UL Classified UL 555 – 1½ Hour Rating, Dynamic for Use in Installations Rated Less Than 3 Hours.
What are the three 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.
What are the two types of fire dampers?
There are two types of fire damper closing system: those with a fuse mechanism and those with an actuator, which is motorised, and to which you can connect a smoke detection system.
How do I choose a fire damper?
Select a fire damper and combination fire smoke damper with a 1½ hour rating for use with a wall, floor, or partition with a less than 3 hour fire resistance rating. If the wall, floor, or partition has a fire resistance rating of 3 hours or more, the damper must have a rating of 3 hours.
What is 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.
What is the difference between fire damper and fire smoke damper?
Fire dampers are provided with an hourly fire rating. Smoke damper’s primary function is to control the movement of smoke in dynamic air distribution systems, and they reduce the possibility of smoke transfer within ductwork or through wall openings.
What is a Type B fire damper?
Does a 1-hour fire rated wall require a fire damper?
For 1-hour or less walls, no damper is required where ductwork is minimum 26 gauge and the ducts do no serve the corridor. Non-fire rated wall that is provided to resist the passage of smoke in specific instances.
What is a round damper?
Round Dampers Backdraft dampers are low-leakage control dampers with spring-assisted blades that open to allow airflow in only one direction. They can be used to release hot exhaust from heating systems without allowing cold air inside.