Ventilation

General details:
For ventilation gratings, we distinguish between horizontal and vertical ventilation. Horizontal ventilation is often used for air outlet/inlet for underground parking facilities, tunnels, metro stations and metro lines. The gratings serve to secure free passage of incoming and outgoing air while at the same time preventing objects from falling into the ventilation shaft. Vertical ventilation is often used for air outlet/inlet for technical installations or for covering concrete walls, air inlets etc. The gratings may be manufactured with special meshes and finishes that suit the environment in which the gratings will be placed.

Grating types:
Grating types NP and SP are the most common gratings for horizontal ventilation. If the gratings are to be used with the top side facing down, we recommend grating type NP

as this type of grating provides an unbroken surface of bars. (See pictures from the Copenhagen Metro and the BBC White City in England, for instance). For vertical ventilation, ventilation gratings with inclined horizontal bars are primarily used, which can be manufactured with the following bar inclination angles: 30˚, 40˚, 45˚ and 50˚.

Mesh sizes:
Venting is often associated with requirements to the open area. The mesh size should therefore be adapted to the individual project. If the gratings also serve as access points, we recommend that the mesh size does not exceed 20 mm in one of the directions.

Fitting methods:
The gratings attach to the construction with welded-in blocks or holes in edge iron. We do not recommend using retainer clamps, as they may loosen due to the wind load.