Airbourne sound transmission is worked out according to the difference in sound pressure levels between two rooms separated by a test doorset.
The Sound Reduction Index, also known as Sound Transmission Loss, is defined as the number of decibels by which sound energy is reduced in transmitting through the test sample. To give a value that more accurately reflects human hearing and perception, the figures are then correlated to a standard reference curve with a single value output, known as the Weighted Sound Reduction Index.
Depending on the door blank, sealing and glazing options used, Halspan’s acoustic performance ranges from 28dB to 35dB.
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