Does ductwork need to be fire rated?
A general rule, however, is that any ductwork system that is intended to operate, or has a special use, under a fire condition and therefore cannot use fire dampers, will require a fire resistance rating.
Where is fire rated ductwork required?
Fire-rated ductworks are required to conduct the smoke outside the building, even using fan assisted systems. If a smoke extraction ductwork is wholly contained within a fire compartment, it must be capable of at least resisting the anticipated smoke temperatures generated during the development of a fire.
Is flex duct fire rated?
Flexible air ducts shall not penetrate a fire-resistance-rated assembly or construction. Flexible air connector lengths shall be not more than 5 feet (1524 mm) and shall not penetrate a wall, floor, or ceiling.
Does a 1 hour fire rated wall require a fire damper?
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.
What is the difference between smoke dampers and fire dampers?
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.
Are fire dampers required in 30 minute walls?
As an alternative to this, a fire rated ceiling having a minimum fire resistance of 30 minutes (including light fittings) may be used (Figure 15 ii). When ducts serve a hazard room, then fire dampers are required. (Figure 15 iii).
What is Flamebar duct?
Flamebar® is a fire-rated duct system which utilizes pre-fabricated ductwork with a fire resistant coating, Flamebar® BW11, in lieu of typical fire wrap. This proprietary coating allows systems to meet and exceed two-hour and four-hour test standards.
Is flexible duct fire resistant?
These flexible ducts have excellent resistance to harsh chemicals, which makes a fire resistant hose a great choice for tasks requiring the movement of dry bulk and other abrasive materials.
What UL 181?
UL 181 is a requirement applying to materials in the fabrication of air duct and air connector systems. The differences between an air duct and air connector lie in the testing they undergo by UL and as a result, the allowed uses by code.
What is the difference between a fire damper and a fire smoke damper?
Does a 2 hour fire rated wall require a fire damper?
If the air duct is an air transfer opening (meaning it is not fully ducted) at the fire-rated barrier, then the duct needs a fire damper where other openings are required to be protected as well. However, two-hour fire-rated barriers do require fire dampers in fully ducted HVAC systems.
What are the different types of ductwork?
There are two major types of ductwork that are common in residential homes: flexible and sheet metal. Flexible ductwork. Flexible ducts are often utilized in spaces where hard and rigid ductwork would be difficult or even impossible. Sheet metal ductwork.
What is fire rated duct?
Fire Rated Ducts. 140 °C as an average value above ambient. 180 °C as a maximum value above ambient. For a Kitchen extract duct (Type A) these temperature limits also apply to the inside surface of the duct within the furnace.
What is a fire rated?
Fire-resistance rating. A fire-resistance rating typically means the duration for which a passive fire protection system can withstand a standard fire resistance test. This can be quantified simply as a measure of time, or it may entail a host of other criteria, involving other evidence of functionality or fitness for purpose.
What is fire rated garage door?
A fire rated door is a very heavy door made of materials like metal or gypsum. Its main purpose is to hold back smoke and to contain fire.