Sound Pressure Level & Nc Curve - Daikin FTV-A Series Engineering Data

Sound Pressure Level
Model Speed
125Hz
High
Med
FTV28A
Low
Quiet
NC Curve
90
80
70
60
50
40
30
20
10
APPROXIMATE
THRESHOLD HEARING FOR
CONTINUOUS NOISE
0
63
1/1 Octave A-weighted Sound Pressure Level (dB, ref 20µPa)
250Hz 500Hz
35 38 35
31 34 30
30 32 28
29 29 25
125 250 500
OCTAVE BAND CENTER FREQUENCY (Hz)
1kHz 2kHz 4kHz
33 29
28 23
25 20
24 18
NC-70 NC-70 NC-70
NC-60 NC-60 NC-60
NC-50 NC-50 NC-50
NC-40 NC-40 NC-40
NC-30 NC-30 NC-30
NC-20 NC-20 NC-20
1k 2k 4k
Sound Level
Overall
(dBA)
8kHz
21 11 38
16 10 33
12 10 30
10 10 28
HIGH (H)
MEDIUM (M)
LOW (L)
QUIET (Q)
8K
Noise
Criteria
32
26
23
22
3D122799
59