Airborne 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 28 to 35dB.

   For more on acoustic performance in doors,


download our Acoustic brochure


To save you time, we’ve collated all our brochures, data sheets, case studies, NBS clauses and UL specifications in one place.


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Accreditation Hub

Welcome to the Halspan accreditation hub. This is where you will find all of the technical information and permission letters you require for your auditing 3rd party certifiers. All you need to gain access is your certificate number for the relevant scheme.

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