
7
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Fan operating noise level
Fan type
Speed [rpm]
Noise level [dB(A)]
at the air outlet side*
at the air inlet side**
at the distance
of 1m
at the distance
of 5m
at the distance
of 1m
at the distance
of 5m
Single-phase motors
WD-16
940
54
42
50
45
1420
64
52
60
55
WD-20
940
56
44
52
47
1420
66
54
62
57
WD-25
940
58
46
54
49
1420
68
56
64
59
WD-31,5
900
63
51
59
54
1420
72
60
67
62
WD-40
700
66
54
62
57
900
71
59
67
62
*Operating noise level in dB(A) -– acoustic pressure level at the air outlet side, in the free field with
taking into consideration the directional factor Q=2 and at the distance of 1 and 5m from the fan.
** Operating noise level in dB(A) – acoustic pressure level at the air inlet side with taking into
consideration the accommodation absorption ability of the compartment A=100m
2
, directional
coefficient Q=2 and from distance of 1 and 5m from the air inlet to the fan.
6. ADDITIONAL EQUIPMENT
For roof fans WD additional equipment can be delivered:
»
roof bases;
»
additional elements;
Roof fan WD mounted on PWD roof base
Fan type
Roof base size
Additional elements
Silencer
Self-closing damper
Inlet diffuser
WD-16
PWD-16
TWD-16
SWD-16
DW-16
WD-20
PWD-20
TWD-20
SWD-20
DW-20
WD-25
PWD-25
TWD-25
SWD-25
DW-25
WD-31,5
PWD-31,5
TWD-31,5
SWD-31,5
DW-31,5
WD-40
PWD-40
TWD-40
SWD-40
DW-40