9. Sound Levels
1.0m
FOUR-WAY CASSETTE TYPE
Microphone
High speed airflow
Medium speed airflow
Low speed airflow
18000btu/h
24000btu/h
36000btu/h
48000btu/h
Octave band center frequency
*
Hz
+
Sound
pr
es
su
re
le
ve
ldB
*
0d
B
=0
.0002
.
b
ar
+
Audibility limits of
continuous white
sound
Octave band center frequency
*
Hz
+
So
un
d
pr
es
su
re
le
ve
ld
B
*
0d
B
=
0.
00
02
.
ba
r
+
Audibility limits of
continuous white
sound
Noise level under three speeds of fan
Model
H
M
L
YKCA-YKHA 18
YKCA-YKHA 24
YKCA-YKHA 36
YKCA-YKHA 48
43
41
38
43
41
38
46
44
41
46
44
41