NBN S 21-208-2

The most recent version (2010) of Belgian norm NBN S21-208-2 offers you several choices.

vertikale_ontrokingKL horizontale_ontrokingKL horizontale_ontroking_met_cfdKL
Vertical smoke removal
Horizontal smoke removal
Horizontal smoke removall/CFD

The impulse ventilators enable the construction of car parks that exude an inviting, open and safe atmosphere without compartmentalisation and/or partition walls.

In fume removal, the air flow rate is determined by the NBN and/or CFD with fume-free access of at least 15 metres from the seat of the fire. The removed air is discharged from the car park with the help of shaft ventilators. These shafts may empty at surface level provided that the distance to the façade of the building is respected and/or the façade has an E60 resistance. These wing muzzles should also not be accessible to unauthorised persons.

Fume removal can be combined with CO/LPG/NOx detection that protects the car park from high levels of the gas in question through a pre-programmed ventilation regimen.

Where possible, the supplied air can be provided via constructional openings or a wing nuzzle. If this is not feasible, then shaft ventilators can provide the air.  Air supply and removal openings can be provided with grids. In case of fire, it may be necessary to close off several air supply and removal openings in order to let the entire air flow rate flow over the location of the seat of the fire.

For this, fixed and/or automatic smoke and fire screens are ideal. The thrust ventilators (impulse or induction) should ensure that the air moves in the right direction through the car park. This should prevent blind spots.

Thrust ventilation uses the natural phenomenon that a mass accelerates (moves) because of an impact. We can this impact ‘thrust’ and it is expressed in Newton.