Specifications

MIL-S’ID-1472E
FAIRLY
EXECUTIVE;
NOISY
NOISY
STENOS
FAIR LY
ORAFTING:
QuIET
NOISY
N41F6
~WARTMENTS:
QUIET
TELEPHONE
SLIUMTLY
~VER6AT10NS:
SATISFACTORY DIFFICULT
-s
\
VERY INTOLERABLY
NOISY
NOISY
VERY
INTOLERABLY
NOISY
NOISY NOWY
~DSRATELY
NOI$Y
NOISY
VERY NOISY
DIFFIWLT
UNSATISFACTORY
‘<~.
-
c?
AREA WHERE
COMMt
IN NORMAL VOICE
\
“/
c
IS (Al > 0.5) ADEOUATE
\
‘ q~
\’
I
1 1
1 I 1. l\
A
I
30
4G 50
60
70
so
w
100
110
AMBIENT NOISE LEVEL, dB(Al
I’4ote: Levets in parentheses refer to voke levels measured one meter fromthe mouth.
FIGURE41. Permissible distance between a speaker and listeners for specified voice levels
and ambient noise IeveIs
5.8.3.4 Facilitv des
i~.
5.8.3.4.1 Gen@. The workspaceor facility designshallminirnim the ambient noise level to
theextent feasible througheffectivesound reductionor attenuationto meet the criteria herein.
5.8.3.4.2 ~tten~at ion bv mate~s and lavou~
.
Acoustic materials with high sound-absorption
coefficients should be provided as necessary in the constmction of floors, walls, and ceiling to
provide the required sound controi. Excessive noise in rooms and work stations should be attenuated
by such means as staggeredconstructionof wrdls,staggeringof doorsin corridors or between rooms,
and use of thick-panedor double-panedwindows.
5.8.3.4.3 ~educt”on of reverberantion time. Where speech communication is a consideration,
the acoustical trewrnen’tof faciiitiea should be sufficient to reduce mverbemtion time below the
applicable limits of Figure 42,
5.8.4
Vibrati~.
5.8,4,1 Whole bodv vibraticm,