Ul fire penetration for metal duct

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Building and fire codes require the construction of some interior walls and floor-ceiling assemblies to resist the passage of fire for a certain length of time, usually expressed in hours. These rated assemblies usually separate rooms, apartments, means of egress including exit corridors and stairways , and the different levels floors of the building. The method of preventing the passage of fire and products of combustion around and through pipes, electrical conduits, ducts, and cables is usually determined in new construction and remodeling by the architect and fire protection engineer, based on building, fire, and NFPA Life Safety Code requirements. During repairs and building and systems maintenance, the Authorities Having Jurisdiction AHJ expect that the same level of protection will be maintained as in the original construction. In most types of construction and occupancies, these penetrations of non-rated partitions and floor-ceiling assemblies require no special procedures; although some occupancies and AHJ will require smoke seal or fire caulk around each pipe, conduit, duct, and cable on both sides of the penetration. The methods and materials used to seal around these penetrations may vary between listings in the Certifications Directory.
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Fire Resistance Products, Systems and Designs

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UL Wall Assemblies, Fire Rated Wall Designs | USG

We all know UL systems are very specific in calling out the requirements that must be met in order to have a complete system. The majority of UL systems are tested with the penetrating item passing through perpendicular to the wall assembly or floor assembly. There are some UL systems that allow the penetrating item to pass through the assembly at an angle which will be indicated within the individual UL system. A perfect example of a UL system that allows for the penetrant to be installed at an angle through the assembly is W-L For those systems that do not specifically allow for the penetrant to be installed at an angle the UL Guide Information for Through-Penetration Firestop Systems can be referenced.
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Construction Concerns: Penetrations of Rated Wall and Floor Assemblies

USA reps. Our complete line of fire protection products helps stop the spread of fire, smoke and toxic fumes. They're easy to install and are approved for a wide variety of firestop applications by Underwriter's Laboratories, Factory Mutual and Omega Point Laboratories.
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