Dependant on which system specification is chosen, sound reduction can reach as high as 44dB.
Sound reduction dB ratings are often quoted from laboratory test results which are misleading in respect of final performance values. They are merely useful for initial specification purposes. Independent on-site tests as carried out by Divisions are recommended as in-situ results will differ from laboratory test certification and are therefore the only true guide to achievable sound attenuation.
Sound certificates are available upon request.