Acoustic Doors
Acoustic steel doors are perfectly suited for applications situated in loud environments that require a reduced level of sound transference. An Acoustic Door is an assembly consisting of a Door, Frame, Ironmongery, Threshold and gasketing, capable of reducing the transmission of Sound. These Doors reduce noise to the desired levels using advanced materials and construction. The performance of these Doors is measured by the STC Rating.
STC stands for “Sound Transmission Class”, a measure of the extent to which sound is prevented from being transferred from one area to another. The higher the STC value, the less sound is transferred from one area to another. The unit for STC Rating is decibel (dB).
The Following chart illustrates the General Sound Retardant performance associated with a range of STC Values.
|
STC Value |
Rating |
Noise / Sound Level |
|
50-60 |
Excellent |
Loud Sounds heard faintly or not at all |
|
40-50 |
Very Good |
Loud Speech Heard Faintly, but not understood |
|
35-40 |
Good |
Loud Speech Heard but hardly intelligible |
|
30-35 |
Fair |
Loud Speech Understood Fairly well |
|
25-30 |
Average |
Normal Speech Understood Fairly well |
|
20-25 |
Under Average |
Loud Speech Audible |
NAFFCO STC Door Performance Chart
|
Door Model |
Max. STC Rating in dB |
Fire Rating in Hours |
STC Test Standard |
Door Core |
|
HALCYON-28 |
28 |
2 |
ASTM E90-09 |
Kraft Honeycomb |
|
HALCYON-32 |
32 |
2 |
ASTM E90-09 |
Kraft Honeycomb |
|
HALCYON-38 |
38 |
2 |
ASTM E90-09 |
Rockwool |
|
HALCYON-41 |
41 |
2 |
ASTM E90-09 |
Rockwool |
|
HALCYON-45 |
45 |
n/a |
ASTM E90-09 |
Proprietary Core |
|
HALCYON-47 |
47 |
n/a |
ASTM E90-09 |
Proprietary Core |
* The above mentioned STC Rating is for Flush Doors only; Maximum calculated STC Rating that can be achieved for Doors with Vision Panel is 35 dB where the Size of Vision Panel will be limited to (200 x 300) mm.
