Sound Power Levels; Sound Pressure Levels; Air Throws - Quartz CWM 55 Technical Manual

AIR THROWS

HYDRAULIC RESISTANCES
SOUND POWER and SOUND PRESSURE LEVELS
973 SERIES CWM (L) ( speed 1 = lowest, 3 = highest)
MODEL SPEED
MIN
55
MED
MAX
MIN
75
MED
MAX
MIN
105
MED
MAX
Sound Power Levels obtained in conformance with BS 4196: Part 5: 1981. Values are shown in dB with a standard
reference of 1 pW.
Sound Pressure Levels are dB relative to 2 x 10
Values relate to a position of 3m away from the centre line of the unit, 1m down.
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SOUND POWER LEVELS

Frequency Hz
125 250 500 1K
36.8 37 39.1 38.8
41 43.4 45.8 45.1
46.7 48.6 50.6 50.4
39.1 44.3 47.2 46.8
43.8 49.1 51.3 51.3
45.5 50.5 53.7 52.9
34.1 38 44 42.3
42.7 45.8 48.9 49.1
46.4 51.6 54.2 54.2
-5 2
N/m and are calculated from results measured in anechoic conditions.
-4-

SOUND PRESSURE LEVELS

2K 4K dBA
34.4 31.7 43
39.6 35.4 49
46.6 39 54
41.6 40.8 51
46.7 39.5 55
48.7 40.8 57
41 38 48
44.2 38.1 53
49.9 42.9 57
dBA NC
25 19
31 25
37 31
33 27
37 32
39 34
30 24
35 30
40 35