Daikin FWW Series Technical Manual page 29

Sound Data
Model Speed
High
FUD20B Med
Low
High
FUD25B Med
Low
FUD30B High
Microphone position: 1.5m below the centre of the unit.
(Tested with 2m length duct at the air discharge outlet and 1m length of air return inlet).
1/1 Octave A-Weighted Sound Pressure (dBA), ref 20µPa Overall
125Hz 250Hz 500Hz
57 50 47
57 46 44
48 42 41
57 53 50
55 51 49
54 50 48
57 55 56
1kHz 2kHz 4kHz
44 40 35
40 35 30
35 30 24
50 44 40
48 42 38
46 40 35
53 51 46
Noise
(dBA) Criteria
8kHz
24 50 43
17 46 41
6 42 36
31 54 49
28 52 47
25 50 45
38 58 53
25