Measurements from the test are evaluated in accordance with BS EN ISO 717/1, formerly BS 5821 :Part 1. A series of standard reference curves is applied to the range 100 Hz – 3150 Hz until unfavorable deviation is as large as possible, but not exceeding 32 dB (This covers the human speech range - other specific noise problems, such as a generator hum, may need specific testing at the appropriate frequencies, falling outside the standard). The figure at 500 Hz is taken to provide a usable interpretation of the results in the form of a ‘weighted sound reduction index’, the Rw figure expressed in RwdB. This is a single figure value that identifies the acoustic performance of the doorset/assembly.

It should be remembered that performance values quoted for products and ranges are based on laboratory test results: on-site testing will generally produce lower results.

Please contact the Technical Sales Department for further advice.