25 September-1 October Fire Protection Week, the importance of fire safety has moved to the focus. Yasemin Akgul, Chairman of the Board of Aironn Fan Engineering, pointed out that poisonous gases and fumes are the leading causes of deaths in fires and this factor constitutes 44% of all fire-related deaths. "jetfan systems are used by thousands of people every day to prevent fire in case of emergency fire from the measures taken against the risk of fire in closed car parks", said Akgul.
Smoke from fire incidents in closed car parks is quite dangerous because of the rapid movement of the compartments without any restrictions. These compartments are large and the height of the parking lot reduces the smoke free substrate depth, and therefore, the smoke spreads to the whole car park, causing the field of view to be distorted and it becomes difficult to determine the exit point of the fire. Up to about 10 years ago, the ventilation of the car parks was done on the basis of exhausting the polluted air with only ducted systems and the attaining fresh air inside or taking in naturally. This system was also used for smoke exhaustion in case of fire. The fact that ducted systems remain cumbersome on issues such as installation, cost, energy, architectural conditions and view has led to the widespread use of jet fan systems, which are more innovative and ergonomic, especially in recent years.
Advantages of jet fan system compared to other systems; Since there is no channel from the shaft in the parking in the jet fan systems, the external pressure losses of the system will be less. Therefore, the motors used in jet fan systems will have less power consumption and lower operating costs. 50% of the vents where polluted air is exhausted in ducted systems are made at the ceiling level and 50% at the ground level. Since jet fan systems will provide a rapid flow from the ceiling level, ground-level heavy gases also flow to the exhaust shaft due to the impulse caused by the impulse. In the event of a fire in the case of smoke at the beginning of the ceiling in the case of fire, the ducted system will use only 50% of its capacity at the beginning of the fire. When the smoke starts to collapse, it will not be able to provide the level of vision specified in the standards.
Another advantage of the jet fan system is that the car park is divided into compartments according to the scenarios and it is possible to control the smoke in the area where the smoke emerges.Thus, smoke can be evacuated in the channel system, but smoke control cannot be achieved.
The jet ventilation system exhausts much faster smoke than a conventional ventilation system with an air exchange rate of 10 per hour.Jet fans are used to direct the flow in the tunnels and to prevent back stratification if the flow rate exceeds the critical speed.Flow control is much more complex since the car parks are much larger. Jet fans should prevent the spread of smoke in the transverse direction. This requires a correct design.