Technibel GRFP 485 R - Page 68

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1-8. Noise Criterion Curves
Concealed-Duct Type
S ingle P hase, 50 Hz
MO DE L
:
DSAFP255R
S OUND LE V E L : HIG H 34 dB(A), NC 22 / LOW 27 dB (A), NC 18
C ONDIT ION : Under the unit 1.5 m
S OUR C E : 220 - 230 - 240
V,
60
50
40
30
20
10
AP PR OXIMATE
THR E S HO L D O F
HE AR ING FOR
C O NTINUOUS
NOIS E
63 125 250 500 1000 2000 4000 8000
NC -50
NC -40
NC -30
NC -20
S ound P ress ure Level (dB ) (0 dB = 0.0002  bar)
F requency at center of sound press ure band (Hz)