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 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 the difference between smoke dampers and fire dampers?
Whilst fire dampers function to help stop the passage of fire, smoke dampers work in a similar way to preserve the integrity of physical smoke barriers e.g. floors and walls. They can also be found within air conditioning and ventilation ductwork.
What is the most common type of damper?
Combination Fire/Smoke Dampers. A combinational damper is used in locations where both a fire damper and smoke damper are required. Although they look very similar to a smoke damper, they work to prevent the passage of both flame and smoke.
What are dynamic dampers?
Dynamic fire dampers are approved for locations where the HVAC system’s blower remains on during an alarm. This unique type of damper has to be powerful enough to close against moving air in order to perform its function and protect against the spread of fire.
What are HVAC fire dampers?
Fire dampers are passive fire protection products used in heating, ventilation, and air conditioning (HVAC) ducts to prevent the spread of fire inside the ductwork through fire-resistance rated walls and floors.
When using foam a Class B fire is extinguished by?
Foam extinguishes Class A Fires by cooling the burning material and removing the heat from the combustion triangle. Foam extinguishes Class B Fires by covering the flammable liquid with a foam blanket, thus cutting off the oxygen supply from the combustion process.
What type of fire extinguisher would be most appropriate to use on a Class B fire?
CO2: A carbon dioxide fire extinguisher works on a Class B fire by expelling CO2 to suffocate the fire, removing the oxygen necessary to keep it burning. It also helps with removing the heat, as the discharge is very cold.
How does a Class C fire extinguisher work?
Class C extinguishers use agents that are capable of separating the elements of the fire triangle: fuel, heat, and oxygen. This way, even if the power and ignition sources are still connected, the flames and heat can be suppressed and extinguished, hopefully, long enough for the power source to be disconnected.
What is a butterfly damper?
Butterfly dampers are used to restrict the flow of materials in ducting systems where flow control and low leakage isolation are a priority. These dampers are especially useful in applications such as incinerators, balancing systems, control air systems, stack isolation, and scrubber systems.
What is a zoning damper?
A zone damper system is a solution that uses your existing HVAC system and turns into multiple zones that can control selected areas of your house more precisely.
What is the difference between VAV & CAV?
Variable air volume (VAV) is a type of heating, ventilating, and/or air-conditioning (HVAC) system. Unlike constant air volume (CAV) systems, which supply a constant airflow at a variable temperature, VAV systems vary the airflow at a constant temperature.
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.
Do you need a fire damper in a 30 minute wall?
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.
Does a 1-hour fire rated wall require a fire damper?
1. Fire dampers are not required in ducted HVAC systems provided the wall is 1-hour fire resistance rated or less, occupancy is not Group H, and the building is equipped throughout with an automatic sprinkler system.
