One of the best performing acoustic vents available in the UK. Provides an outstanding Dn,e,w; 42dB(A) for areas with high external noise transmission. Humidity control to regulate supply of fresh air effectively throughout the day in response to changing indoor humidity levels.
All three are relevant to ventilation as all systems require external penetrations in the façade of the building which can allow noise transfer.
The decibel scale runs from the faintest sound the human ear can detect (0dB) to over 180dB that is similar to the noise a rocket creates during a launch.
Acoustic ventilation solutions from Greenwood have been independently tested to the latest test standard: BS EN ISO 717-1: 1997 and include varying performance at different frequencies, e.g. pink noise/white noise.