TM 5-805-4/AFJMAN 32-1090
Figure 4-2. Natural Frequency of a Double Wall With an Air Space.
flanking path (path 2) becomes significant and
tilled with sound absorption material. These con-
structions can provide an improvement in TL of 5
limits the amount of noise reduction that can be
to 10 dB in the middle frequency region and 10 to
achieved. Therefore, structural separation (part C
15 dB in the high frequency region, when properly
of figure 4-3) is required in order to intercept the
executed.
flanking path (path 2) and achieve the potential of
the double wall.
4-3. Transmission Loss-Walls, Doors, Win-
(3) Resilient wall mountings. It is sometimes
dows.
possible to enhance the TL of a simple concrete
block wall or a study-type partition by resiliently
Generally a partition will have better noise reduc-
tion with increasing frequency. It is therefore
attaching to that wall or partition additional
layers of dry wall (gyp. bd.), possibly mounted on
important to check the noise reduction at certain
spring clips that are installed off 1 inch or 2 inch
frequencies when dealing with low frequency, rum-
thick furring strips, with the resulting air space
ble type noise. Note that partitions can consist of a
4-4
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