• Sound power levels in the ducts measured in accordance
with the standard ISO/DIS 5135:1995.
• Sound pressure levels in the room (10 m
2
sound
absorption) determined according to the regulation
4873/531/84 issued by the Finnish Ministry of
Environmental Affairs.
L
w
A = A-weighted sound pressure level
* = difference between sound power level and pressure level when unit location and total absorption
area are taken into account (e.g. in a classroom, L
w
A -* = 12 dB)
LpA, dB(A)
Medium
frequency
of the
octave band,
Hz
CONTROL POSITION / AIR FLOW l/s
CONTROL POSITION / AIR FLOW l/s
63
125
250
500
1000
2000
4000
8000
Lw, dB
LwA dB(A)
Hz
CONTROL POSITION / AIR FLOW
LwA, dB(A)
LpA = A-weighted sound pressure level (10 m
2
sound absorption)
Sound power level from VALLOX to supply
air ducts by octave band Lw, dB
Medium
frequency
of the
octave band,
Hz
CONTROL POSITION / AIR FLOW l/s
Sound power level from VALLOX to
extract air ducts by octave band Lw, dB
CONTROL POSITION / AIR FLOW l/s
63
125
250
500
1000
2000
4000
8000
Lw, dB
LwA dB(A)
Hz
Sound power level coming from VALLOX through the
envelope to the rooms where the unit has been installed
CONTROL POSITION / AIR FLOW l/s
LpA, dB(A)
Sound power level from VALLOX to supply
air ducts by octave band Lw, dB
Sound power level from VALLOX to
extract air ducts by octave band Lw, dB
Sound power level coming from VALLOX through the
envelope to the rooms where the unit has been installed
VALLOX 252 D
SOUND VALUES
4
VALLOX 252
+ SILENCER
6
169 l/s
68.0
63.5
61.0
49.5
47.0
45.0
35.0
27.0
70.0
55.5
4
129/139
40
6
166/176
44
8
212/217
47
VALLOX 252 D
8
226 l/s
74.5
72.0
66.0
52.0
49.5
49.5
38.0
31.0
77.0
61.0
6
179 l/s
72.0
68.5
61.0
48.0
48.0
45.0
34.0
27.0
74.0
57.0
4
141 l/s
68.5
66.0
57.0
43.5
43.5
38.5
28.5
18.5
70.5
53.5
1
85 l/s
63.0
59.0
47.5
36.5
36.0
28.0
15.5
64.5
45.0
8
208 l/s
69.5
67.0
64.5
54.5
50.0
50.0
39.5
32.0
72.0
59.0
4
138 l/s
65.5
60.0
55.5
44.5
43.5
38.5
20.0
66.5
50.5
30.0
1
76 l/s
62.0
55.0
48.0
36.0
38.5
28.5
20.0
63.0
44.0
1
78/85
33
8
204 l/s
67.0
65.0
51.5
36.5
30.0
27.0
18.5
69.0
49.5
6
167 l/s
63.0
62.5
48.0
31.0
24.5
20.5
65.5
46.5
4
135 l/s
59.5
59.0
43.0
25.5
17.0
62.5
42.5
1
80 l/s
55.5
53.5
34.0
57.5
37.0
8
209 l/s
66.5
62.5
50.5
41.5
32.0
27.0
15.5
68.0
48.0
6
169 l/s
63.0
60.0
46.5
35.0
25.0
19.0
65.0
44.5
4
133 l/s
61.0
57.5
40.5
27.5
16.0
62.5
41.0
1
77 l/s
55.0
52.0
33.0
18.0
13.5
14.0
57.0
35.5
4
131/138
42.5-*
38.5
6
167/175
47-*
43
8
208/221
50.5-*
46.5
1
74/82
36-*
32
