What materials are used for the pipelines and equipment of the smoke extraction system in Vietnam?

What materials are used for the pipelines and equipment of the smoke extraction system in Vietnam? - image from internet

Based on Section D.9, Appendix D of the National Technical Regulations on Fire Safety for Buildings and Structures issued with Circular 02/2021/TT-BXD, the materials used for the pipelines and equipment of the smoke extraction system are regulated as follows:

The pipelines and equipment of the smoke extraction system must be made from non-combustible materials with a fire resistance rating not less than:

- EI 120 - for pipelines and smoke ducts located outside the fire compartment served by the system. In these cases, regular open-type fire dampers should not be installed at positions where the pipelines and smoke ducts pass through fire-resistant walls or floors.

- EI 60 - for pipelines and smoke ducts located within the fire compartment served by the system, used to extract smoke from enclosed car parks.

- EI 45 - for vertical pipelines and smoke ducts within the fire compartment served by the system, used for direct extraction of combustion products in the area being served.

- EI 30 - for other cases within the fire compartment served.

NOTE 1: Fire resistance ratings are not required for pipelines within ducts or technical shafts that are enclosed by fire-resistant partitions with equivalent fire resistance as specified.

NOTE 2: Regular open-type fire dampers are fire dampers that will close when there is a fire.

The arrangement of smoke extraction fans with appropriate fire resistance ratings (e.g., 0.5 hours at 200 ºC, 0.5 hours at 300 ºC, 1 hour at 300 ºC, 1 hour at 400 ºC, 1 hour at 600 ºC, or 1.5 hours at 600 ºC, ...) must be based on the calculated temperature of the conveying air, corresponding to the fire compartment being served.

Smoke and combustion products must be discharged outside the building or structure through either of the following options:

- Through smoke vents or smoke exhaust shafts located on external walls without windows or with a minimum distance of 5 m horizontally and vertically between windows, and a minimum distance of 2 m above the ground. The distance to windows can be reduced if the smoke exhaust velocity is not less than 20 m/s.

- Through separate smoke exhaust shafts located on the ground at a distance of not less than 15 m from external walls with windows and intake vents of the air conditioning system, as well as the pressure increase of the building and neighboring buildings.

Smoke extraction from smoke extraction pipes from basement and semi-basement levels is allowed through ventilated compartments. In this case, the smoke exhaust openings must be placed at least 6 m above the floor of the ventilated compartment (at least 3 m in relation to the structure of a building vertically and 1 m horizontally) or, for wet-type exhaust devices, at least 3 m above the floor level. No smoke dampers should be installed on these pipes.

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