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The Influence Of Glazing
For further details relating to the influence of glazing in a door:
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Information
Norsound have carried out in excess of 200 sound attenuating tests in conjunction
with a wide range of door constructions. Single leaf, single action, double leaf
(pairs), double action configurations, glazed, unglazed, doors with letterboxes
in, the works! All testing has been carried out to the requirements of BS EN IS0
140: 3: 1995.
The fundamentals of the BS EN IS0 140-3 test are quite simple:
- A specimen is placed between a sound transmitting room and a sound receiving
room
- Sound is generated over a range of frequencies in the transmitting room
- The sound pressure levels (loudness) of the sound are measured in the receiving
room after passing through the specimen
- The received sound pressure levels are deducted from the transmitted sound
pressure levels to determine the sound pressure loss at each of the tested
frequencies
In addition to providing for cost effective sealing systems for acoustic doorset
applications, a design requirement to satisfy Norsound specifications is that
the seals should be simple to use and provide for minimal interference with the
operation of the doors.
To provide for a consistent basis for comparisons testing, Norsound carried out
tests based upon the use of a 2040 x 926mm door size. This is the largest single
leaf door size described by reference to BS 4787 Pt. 1.
Test data is for guidance on acoustic performance only.
For example, a 44mm door core does not necessarily equate to an FD30 - 30 minute fire rating. Similarly, a 54mm door core does not necessarily equate to an FD60 - 60 minute fire rating. For further information and technical advice, please contact the Norsound Technical Department on 01661 831 311