1000
0,1
0,2
400 500
.
V / m³/s
0,3
0,5
0,4
1,0
2,0
2000
5000
3000
.
V / m³/h
10000
300
∆
p / Pa
t
η
=
0,
80
m
ax
2900 U/min
1450
950
710
ρ
= 1,2 kg/m³
2000
1000
200
50
100
300
400
500
14
MIETZSCH GmbH Lufttechnik Dresden
Großenhainer Str. 137
01129 Dresden
Fax (0351) 8 58 00 74
http://www.mietzsch.de
Radial fans of plastic material
VRE 250 / 731
Impeller with backward curved vanes
PERFORMANCE
MOTOR VERSIONS
for standard motor 3~400V/50Hz
(Data for other motors, such as single-phase, polechanging or Ex, upon inquiry.)
Working range
- stable regime in entire characteristic
range
- fan can be operated beyond
characteristic specified
- parallel connection possible, series
connection after consultation with the
manufacturers
Design features
- welded impeller with 8 vanes curved
backward
speed 2900rpm with FRP-impeller
- casing
deep-drawn for PVC or PPs
welded for special materials
- motor outside the flow conveyed
- robust sheet metal base, zinc-coated
- vibration absorbers in range of
delivery
- variant connectors of casing
power
nom. motor nom. motor
weight
fan type
speed
required
power
current
with motor
L
A3m
L
WA
rpm
kW
kW
A
kg
dB(A) dB(A)
63
125 250 500 1000 2000 4000 8000
VRE250/731W710
710
0,05
0,09
0,36
35
42
59
44
53
50
55
52
44
30
21
VRE250/731W950
950
0,11
0,18
0,62
36
47
64
50
55
56
57
60
53
46
28
VRE250/731W1450
1450
0,37
0,37
1,03
36
55
73
59
62
68
69
66
62
56
43
VRE250/731W2900 GfK
2900
3,2
4,0
7,7
75
70
88
74
78
83
84
80
76
69
56
GfK - impeller made of fibre reinforced plastic (FRP)
L
A3m
= A - weighted sound pressure level at distance of 3 m
L
WA
= A - weighted sound power level in duct
octave-band L
WA-Okt
/ dB(A)
i_v
re_
en
(
09/
06
)
PRINCIPAL DIMENSIONS
(
made of PVC or PPs
)
The principal dimensions refer to elastic
connectors on inlet and outlet and for
housing position 90R.
Height of axis is identical for all housing
positions.
Further dimensions see page 26.
For special materials see page 28.
Number of
vibration absorbers
: 4
(in case of heavy motors 6)
Drawings in format dxf
--> MIETZSCH-CD
480
298
41
5
34
6
332
46
0
25
max.1015
328
Ø 25
0
Ø 250
280
