AR

Functional description

Ventilation grilles are air terminal devices for the supply air and extract air of ventilation and air conditioning systems. They direct the supply air into the room. Ventilation grilles with adjustable blades allow for adapting the discharge direction to the local conditions. The result is a mixed flow ventilation in comfort zones and industrial zones, with good overall room ventilation.

Induction slows the airflow down, i.e. the airflow velocity decreases as the distance from the grille increases. The distance at which the airflow velocity reaches a certain defined value, e.g. 0.2 m/s, is called throw distance. The supply air jet from wall grilles that are installed near the ceiling achieves a larger throw distance than a free jet (from a grille that is not installed near the ceiling). Single grilles, groups of grilles and continuous horizontal runs all achieve different throw distances.

In cooling mode it is necessary to take account of the jet deviation towards the occupied zone, which increases as the supply air to room air temperature difference increases and the discharge velocity decreases. In heating mode the supply air jet deviates towards the ceiling. This has no negative effect on the airflow velocity in the occupied zone, but it may affect the complete ventilation of the room.

Ventilation grilles, rectangular, made of aluminium, for supply and extract air.
Rectangular profile border.
Preferably for wall and ceiling installation but also suitable for rectangular ducts.
Ready-to-install component which consists of a border and fixed horizontal blades.
Countersunk holes for fixing onto an installation surface.
Sound power level of the air-regenerated noise measured according to EN ISO 5135.

Special characteristics

• Fixed blades
• Front border
• Countersunk holes

Materials and surfaces

• Border and blades made of aluminium
• P3: Border and blades powder coat RAL9010:20%
• P6: Powder coated RAL CLASSIC colour. Gloss level 30%

Technical data

Nominal sizes:: 150 x 100 to 1200 x 600 mm

Maximum volume flow rate (extract air): 1202 l/s or 4327 m³/h at LWA max. 40 dB(A) without attachments:

Sizing data

V _______________________ [m³/h]
Δpt _______________________ [Pa]
Air-regenerated noise LWA _______________________ [dB(A)]

Principal dimensions

L [mm]
Nominal length of the ventilation grille

H [mm]
Nominal height of the ventilation grille

m [kg]
Weight

Nomenclature

LWA [dB(A)]
Sound power level of the air-regenerated noise

V [m³/h] and [l/s]
Volume flow rate

Δpt [Pa]
Total differential pressure