• The importance of air velocity in kitchen ventilation systems
One of the most important factors when planning a commercial kitchen ventilation system is the air velocity.
Even if the air volume flow is calculated correctly, an incorrect air velocity can significantly reduce the filter performance.
In conventional kitchen ventilation systems, the air velocity is usually about 10 m/s.
However, this value is too high for electrostatic precipitators (ESP) .
The optimal filter velocity is between 2 and 3 m/s.
The lower the air velocity, the longer the air remains in the filter cells – and the more efficiently grease and smoke particles are separated.
Therefore, duct cross-sections , fan power and plenum boxes must be carefully designed.
A plenum box at least 1 meter long , corresponding to the channel cross-section of the device, should be installed in front of the ESP device.
This ensures that the air is slowed down and evenly distributed across the entire filter surface.
The correct air velocity not only has a positive effect on filter performance , but also on energy consumption , the lifespan of the system and operational safety .
