Ventilation and smoke protection systems ensure fire safety for houses in groups F1.2, F4.3 and mixed-use houses in Vietnam
What general regulations must ventilation and smoke protection system to ensure fire safety for houses in groups F1.2, F4.3 and mixed-use houses meet? Looking forward to your guidance.
Regulations on ventilation and smoke protection systems in houses of groups F1.2, F4.3 and mixed-use houses in Vietnam
Pursuant to Subsection A.2.29 Section A.2 Appendix A National Technical Regulations on Fire Safety for Houses and Constructions issued together with Circular 02/2021/TT-BXD (Expires: January 16, 2023) has the following provisions:
A.2.29.1 Groups of rooms with different functions located within the same fire compartment must have independent ventilation, air conditioning and heating systems.
A.2.29.2 The room where ventilation equipment is located must be located within the fire compartment that the device serves, allowing ventilation equipment of systems serving different fire compartments to be placed in a common room, except in the following cases:
- Equipment of air supply systems, from air recirculation, serving rooms with fire and explosion hazard classes C1 to C3, must not be placed together with equipment of systems using for rooms with other fire and explosion hazard classes;
- Equipment of inlet air supply systems, serving residential rooms, must not be placed with equipment of inlet air supply systems, serving rooms used in life services, nor with equipment equipment of exhaust systems,
- Equipment of exhaust air systems (pushing out unpleasant smelling air, from smoking rooms, toilets and the like), must not be located together with equipment of inlet air supply systems;
- Equipment of local suction and discharge systems of dangerous and explosive mixtures should not be placed together with equipment of other systems.
A.2.29.3 Ventilation systems serving different fire compartments are not allowed to use the same outside air receiving equipment (suction vents). The horizontal distance between air intakes located in adjacent combustion chambers must not be less than 3m.
A.2.29.4 The horizontal distance between outside air receiving devices (suction nozzles) and nozzles of the same air exhaust system installed on an exterior facade must be no less than 10m. If the horizontal distance cannot be guaranteed, the vertical distance must be not less than 6m.
A.2.29.5 It is allowed to construct air ducts and manifold sections of all systems within the fire compartment they serve, according to the following regulations:
a) Made from non-flammable materials with a fire resistance limit not lower than EI 15, provided that the air pipeline must be placed in a common well, with a structure surrounding the well with a fire resistance limit not lower than REI 120, and there must be fire prevention valves at pipe locations through the structures surrounding the well.
b) Made from non-flammable materials and have fire prevention valves in all locations where the pipeline penetrates walls, partitions and floors that require fire resistance.
Air duct sections located outside the fire compartment they serve, from the fire prevention components on the boundary of that fire compartment, must have a fire limit not less than EI 180.
A.2.29.6 When arranging air ducts and manifold sections of any system serving different fire compartments in a common channel or well, the surrounding structure of that channel or well must have a resistance limit. fire not less than REI 180 and the structure of those pipes must ensure the following regulations:
a) Have a fire resistance limit not lower than EI 60 when the pipeline is located in the fire compartment it serves and have fire prevention valves installed at locations where the pipeline penetrates the structure surrounding the canal and well.
b) Have a fire resistance limit not lower than EI 60 when the pipeline is located outside the fire compartment it serves, and have fire prevention valves installed at locations where the pipeline penetrates fire prevention floors located at the boundaries of the fire compartments, with floor fire resistance limit of REI 180.
A.2.29.7 Gas pipes with fire resistance requirements must be made from non-flammable materials, have a thickness of not less than 0.8 mm and must have an axial thermal expansion compensator. Sealing the joints of gas pipes must be done with non-flammable materials.
A.2.29.8 Fire prevention valves must have remote and automatic control devices. It is not allowed to use fire valves with actuators with thermal elements. Fire resistance limits of fire valves must ensure the following regulations:
- Not lower than EI 90, when the corresponding fire compartment has a fire resistance limit of REI 120 or higher.
- Not lower than EI 60, when the corresponding fire prevention part has fire resistance limit REI 60.
A.2.29.9 The smoke exhaust system must ensure the following regulations:
- The fire resistance limit of exhaust fans must meet the working requirements according to the calculated temperature of the air flow;
- Gas pipes and channels made from non-flammable materials have fire resistance limits not lower than:
+ EI 180 - for air ducts and channels located outside the combustion compartment they serve;
+ EI 120 - For vertical air ducts and channels within the fire compartment they serve.
- Smoke prevention valves must have remote and automatic control devices and have fire resistance limits not lower than:
+ EI 60 - for car parking spaces and isolated corridors of closed garages;
+ EI 45 - for rooms with 50 or more people present simultaneously, calculated according to Table G.9 (Appendix G), within a certain period of time and for atriums;
+ EI 30 - for corridors, hallways, side corridors.
A.2.29.10 Fans used to push combustion products out must be placed in separate rooms, surrounded by type 1 fire partitions, and guaranteed ventilation in case of low-temperature fires. The air in the room does not exceed 60 ºC.
A.2.29.11 Wells that enclose the pipes of the air supply system for smoke protection must have a fire resistance limit not lower than the fire resistance limit of the floors through which they cross. The required fire resistance limit of the air ducts of this air supply system must not be less than:
- EI 60 - for cascading air ducts of the air supply system for fire compartments and isolation corridors of closed garages;
- EI 30 - for air ducts of protective air supply systems for stairwells and elevator wells, as well as for fire compartments at ground levels.
A.2.29.12 Fire valves of the air supply system for smoke protection must have a fire resistance limit not lower than the fire resistance limit required for the air pipes of this system.
A.2.29.13 Control of equipment and operating mechanisms of the smoke protection system must be performed both automatically (from the fire detection system) and remotely (from the control desk of the dispatcher's on-duty crew and from the buttons located at the emergency exits of the floors or in the fire fighting cabinets). In all fire hazard scenarios, normal ventilation and conventional air conditioner (not used in anti-smoke protection mode) and immediately open the smoke ventilation system and supply air for smoke protection.
A.2.29.14 Information on the actual location and condition of the equipment and operating mechanisms of the smoke protection system must be monitored and identified at the control station.
A.2.29.15 The operating structures and equipment of the smoke protection system must ensure operational reliability determined by a safety probability of not less than 0.999.
Best regards!
