McQuay MCK 010C, User Manual

Page: 17 / 101

CK30A/AR NC Curves
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
S
ound pr
es
su
re
le
ve
l (
dB
, r
ef
20
Pa
)
M easured in anechoic room at 1.5m below the facia
NC-40
NC-35
NC-30
NC-25
NC-20
NC-45
NC-50
High fan
M edium fan
Low fan
CK40A/AR NC Curves
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
S
ound pr
es
su
re
le
ve
l (
dB
, r
ef
20
Pa
)
M easured in anechoic room at 1.5m below the facia
NC-40
NC-35
NC-25
NC-20
NC-45
NC-50
High fan
M edium fan
Low fan
NC-30
16