Abstract
The variation in the sound reduction index as a function of the size of a test specimen was investigated. Five different sizes of one particular hinged window were tested. In addition, tests were carried out with a sound insulating double glazing and a laminated pane mounted in normal wooden frames. Some differences in the sound reduction index due to the different test specimen sizes were found. However, these differences were slight compared with the practical difficulties and costs which tests on several sizes would involve. One size of test specimen is therefore considered to be sufficient for sound reduction index measurements on windows with respect to labelling. This practice is currently in use in Denmark.
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