Engineering Manual

A-220
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
SPL(dB(A))
LINE
55
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
MUZ-GL24NA
MUZ-GL24NAH
55
COOLING
NOTCH
HEATING
COOLING
SPL(dB(A))
LINE
HEATING
48
-
MUY-GL09NA
NOTCH
SPL(dB(A))
LINE
49
-
MUY-GL12NA
COOLING
HEATING
NOTCH
SPL(dB(A))
LINE
49
-
MUY-GL15NA
COOLING
HEATING
NOTCH
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
BAND CENTER FREQUENCIES, Hz
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE