AM, EM, AQ, BA, ASW - IOM
page: 13/64
Ing.Ji
ř
í Jiránek
Evaluation point factor:
OPEN WINDOW/DOOR
OUTSIDE
NOISE SOURCE
CLOSED WINDOW/DOOR
Outside, FB = 0dBA
Open window/door, FB = -10dBA
Closed single window/door, FB = -17dBA
Closed double window/door, wall, FB = -23dBA
Distance factor:
Distance
m
1.2
1.5
1.8
2.1
2.4
2.7
3
4.6
6.1
7.6
9.1
FL
dBA
-9.5 -11.5
-13 -14.5 -15.5 -16.5 -17.5
-21 -23.5 -25.5
-27
Distance
m
12.2
15.2
18.3
21.3
24.4
27.4
30.5
38.1
45.7
53.3
61
FL
dBA
-29.5
-31
-33 -34.5 -35.5 -36.5 -37.5 -39.5
-41 -42.5 -43.5
Determining the acoustic noise level at the evaluation point:
The resulting noise level represents the plain sum of the acoustic output level and all the
factors.
Sound Power Level
dBA
Noise source position factor dBA
dBA
Barrier attenuation factor dBA
dBA
Evaluation point factor dBA
dBA
Distance factor dBA
dBA
Sound Pressure Level at evaluation point
dBA
This approach leads to an “ESTIMATE” of the resulting noise level. This estimate assumes the
usual installation conditions. The actual noise level can only be established with a measurement
after the installation, in every particular case. If this estimate approximates the noise level limit,
you should consider the necessity of additional measures.
MASTER THERM CZ IS NOT LIABLE FOR ANY DIFFERENCES BETWEEN THE RESULTS
OBTAINED WITH THE USE OF THIS METHOD AND THE INSTALLED REALITY
