The EXHAUSTO VIR diffusor is used for supply air in ventilation systems which require both low sound levels and a directional airflow.

The VIR supply air diffuser can be mounted in any location. The diffuser is fitted with a rotatable valve disc, which makes it possible to set the air gap to the required capacity. The directional sector plate has 180° dispersion, which makes the diffuser especially suitable for mounting in a ceiling corner or on a wall. If the diffuser is to be mounted in the centre of a room, the sector plate should be removed.

The diffuser can be fitted directly to a spiro tube using the supplied bayonet mount. A foam rubber ring glued to the diffuser ensures air-tightness between fitting and bayonet mount. The VIR diffuser is made of white-lacquered steel sheet, RAL9003.

VIR

VIR

The drawings  show the capacity with the control valve fitted in the pipe socket The drawings show volume flow qv (l/s and m³/h), total pressure drop p_t (Pa), Throw length L₀₂ (m) and A-weighted sound power level (L_WA) for various settings a (mm) as well as with and without sector plate.

VIR100 with sector plate

VIR100 without sector plate

VIR125 with sector plate

VIR125 without sector plate

VIR

Sound power level in octave band L_w (dB)
Sound pressure level L_w (dB) = L_WA + K_ok
The L_WA can be read off the capacity charts. The constant K_ok can be seen on the tables below.

VIR with sector plate

VIR without sector plate

Integrated sound attenuation, DL (dB)

VIR

The throw and dispersion pattern with final speed L_0.2 m/s.

The throw L_0.2 is defined as the greatest distance from the centre of the fitting to isovel 0.2 m/s. The throw is indicated for ceiling mounting.

Dispersion pattern VIR

With sector plate (eccentric):                                Without sector plate (central):

VIR without sector plate

VIR with sector plate

Air volume calculation: