Mietzsch VRE 560 Series Operation manual

Issue 09/06
GmbH Lufttechnik Dresden
USER INFORMATION
RADIAL FANS
RADIAL FANS
SERIES VRE 100 ... 560
direct driven

Data specified herein are subject to alteration without prior notice.
They will not be valid without written confirmation by the manufacturers.
Application in all ranges of ventilation
High chemical resistivity by the use of plastic materials
(PVC, PPs, PE, PVDF,GfK, electrically conductive plastic)
High efficiency and little noise emission
Volumetric flow up to 36 000 m3/h
Pressure increase up to 3 300 Pa
Capacity gradation by nine sizes and two versions
Housing positions left and right (L and R)
Explosion-proof versions according to European Directive 94/9/EG (ATEX)
Varied casing connectors
Many electrical and ventilation accessories
Radial fans of plastic materials
Series VRE VRE 100 ... 560
direct driven
i_vre_en (09/06)

APPLICATION
High resistance to corrosion resulting from the use of high-quality plastic materials makes the radial fans of type VRE
suitable in particular for process exhausting devices in the chemical and pharmaceutical industries, for ventilating
laboratories, battery rooms, pickling and washing plants, galvanic and agricultural facilities etc.
TECHNICAL DESCRIPTION
Main components of the fans are the impeller, spiral casing, casing connections, base, and driving motor. The motor is
flange-connected directly to the base and completely separated from the flowing medium. The impeller has been arranged
on the motor shaft and is driven directly. Steel components - such as screws, hub and hub connections - are made of acid-
resistant steel or protected against corrosion by plastic coverings.
The aerodynamic design of the fans is state-of-the-art so that high efficiency, low sound levels, and high performance
density can be achieved.
Every fan is supplied as a complete assembly unit ready for use. Vibration absorbers matched in size and quantity, elastic
connections on the pressure and suction sides, and a condensate drain bore with closing cap are elements of the standard
range of delivery.
Design features
Impeller: There are two impeller designs covering a wide range of performance:
Type 731 with vanes curved backward
Type 734 with vanes curved forward
Special impellers are used for special applications. Impellers with vanes in radial arrangement, for instance,
are advantageous if the medium conveyed contains intensely sticking substances.
The impellers are made of single components and assembled with progressive joining methods. Dynamic
balancing complies with ISO 1940.
Materials: PVC, PPs, PVDF, FRP (for high demands), electrically conductive plastic material (explosion-proof fans)
Casing: The casings are made of deep-drawn half shells (sizes 100 … 250 made of PVC or PPs) or even side walls
and a jacket which are tightly welded. The connection diameter on the suction side is in any case identical with
the nominal size of the fan. The casing can be opened on the suction side for cleaning. A condensate drain has
been arranged in deepest position.
Sealness of the shaft lead-through that is sufficient for many applications results from the vanes with far end
arrangement. Higher demands on sealness are met by an additional seal between impeller and casing (see
section Shaft seal).
A shatter guard or an additional FRP reinforcement should be arranged for cases of high demands on safety.
A wide range of casing connections is available for connecting ventilation lines.
Note: Connected plant components must not load the fan mechanically.
Materials: PVC, PPs, PVDF, FRP (for high demands), electrically conductive plastic material (explosion-proof fans)
Base: Robust welded design of zinc-coated sheet steel, optionally available: varnished or of stainless steel.
Motors: Standard motor: 3 ~ 400 V/ 50 Hz, degree of protection IP 54, design B 5 (in special cases B 14 or B 3)
Single-phase motors 230 V/ 50 Hz, motors with special voltages and different degree of protection, pole-
changing and explosion-proof motors
Motors with thermal winding protection (PTC resistor) --> special design TS
Motors with integrated frequency inverter --> special design MFU
03
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
intake socket
elastic connection
with tensioning tape
impeller
hub protection cap
impeller fastening
casing
base
motor fastening
adapter ring
motor
vibration absorbers
condensate drain
Radial fans of plastic materials
Series VRE direct driven
Technical explanation
i_vre_en (09/06)

CONDITIONS OF USE
permissible ambient temperature: -30 °C … 40 °C (EX motors -20 °C ... 40 °C)
permissible temperature of medium conveyed: -30 °C … 40 °C
Higher temperatures depend on the design size, material, and speed rate and are subject to consultation with the
manufacturers.
The applied materials have good chemical resistance against many substances. It should be considered, however, that
evens plastic materials are attacked by certain chemicals. This depends on the following items:
Chemical composition and concentration of medium conveyed
Temperature and time of action
Mechanical loading and residual stress resulting from processing
Many applications in fields such as laboratories and stockrooms for chemicals, in agriculture and damp-loaded processes
led to good results with "standard materials" such as PVC or PPs that can be used without any problem in most cases.
Critical applications may occur in the process-technological industry - surface refinement, pickling plants, process exhaust
air in microelectronics.
For selection of suitable materials the purpose of use of the fan and the type of medium conveyed should be
specified in requests or orders.
Slightly dust-laden media can also be conveyed but lead to increased wear.
Notes on outdoor use: If possible, fans should not be exposed to intense ultraviolet radiation.
The motor should be protected by a weather hood.
Ambient conditions have to be considered in material selection.
Working range: The fans show stable operation in the entire range of the characteristic shown. Operation with smaller
volume flows is possible but very ineffective. Use with larger volume flows may lead to motor overload
(type 734 in particular) and must be avoided.
Parallel arrangement: of type 731 is possible in any case, of type 734 after consultation with the
manufacturers only.
Series arrangement: requires the manufacturers' agreement (increased casing pressures).
SHAFT SEAL
Radial fans VRE with standard design have vanes in far end arrangement and formed on the rear hub protection cap. This
means permanent intake of external air through the minimized gap of the shaft lead-through if
pressure loss on suction end is greater that one third of total pressure loss.
This is the reason why components with high pressure losses such as washers, filters, separators etc. should be arranged,
whenever possible, before the fan, i.e. on the suction side.
SPECIAL DESIGNS and ACCESSORIES (more details at the end of this brochure)
Cleaning opening, shatter guard, weather hood for motor, various connections for condensate drain, base of stainless
steel, intake and outlet protective grating
Ventilation components: ducts, elbows, flaps, air hoods, pipe and profiled silencers
Electrical accessories: repair switches, motor protection switches, pole changing switches, complete fan controls,
frequency inverters (also with pressure and volumetric flow regulation), air flow monitoring.
A shaft seal is used if this "aerodynamic casing sealing" is
not sufficient. This may happen if, for instance, there is the
risk of aggressive gas escaping with the fan at rest.
The hub body of special design GD carries a sealing ring
with axially acting flexible sealing lip.
The counter-runway in the casing wall consists of a material
with good sliding properties (stainless steel or a special
plastic material, the latter in cases of action of hydrochloric
acid, chromic aid, hydrofluoric acid etc.).
This seal is used for high demands on gastightness and in
cases of relatively dry outlet air. It is distinguished by its long
service life.
There are various special seals such as gas shutoff seals,
labyrinth seals etc. for very high demands on tightness, in
particular in cases of high humidity and much condensate.
The manufacturers should be contacted for such
applications.
04
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic materials
Series VRE direct driven
Technical explanation
impeller hub
casing wall
counter-runway
sealing ring
i_vre_en (09/06)

05
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
EXPLOSION PROTECTION
Guideline 94/9/EG (ATEX) newly regulates explosion protection for non-electrical devices from July 1, 2003. In addition to
observation of design and safety instructions according to DIN EN 14986 and DIN EN 13463, the fan has to be assigned
exactly to the relevant degree of protection and labelled accordingly. The manufacturers have to prove conformity.
Areas with hazard of explosion exist in the chemical industry, in gasworks, coking plants, varnishing units, petrol stations,
sewage and wastewater treatment plants, laboratory systems etc.
Prerequisites of explosion are:
Flammable substances (such as gas, dust),
Oxygen in sufficient quantity of air
Ignition source (sparks, fire, hot surfaces, electrostatic discharges)
The following measures have to be taken if explosions cannot be excluded:
Prevention of explosible atmosphere
Avoidance of ignition sources
Moderation of damaging effects of explosions
An efficient and supervised ventilation system is often a sufficient measure for avoiding ignitable atmosphere and,
consequently, hazard of explosion.
Protection demands on a fan depend on the probability of occurrence of explosible atmosphere in the medium conveyed
or/and in the surrounding. Hazard is classified in three zones:
The plant operator or the relevant board of control has to decide which protection is necessary and which additional
regulations have to be considered. This means that the customer has to specify in the order which kind of protection the fan
has to have.
Fans VRE are supplied for the following types of ignition protection:
On principle, application in zone 0 is not possible. Gases of explosion group IIC (hydrogen excluded), gases with ignition
temperature below 200 °C, and combustible dusts are likewise impermissible.
Classification generally differentiates between inside (medium conveyed) and outside (surrounding). Every zone of hazard
requires its special design. Explosion-proof electrical devices (motors, switches etc.) and electrically conductive materials
(preferably conductive and flame retardant polypropylene --> PPsX) are employed. General classification is as follows:
Special demands for operation with frequency inverter
Motors with increased safety EEx e II must not be used in inverter operation. Motors EEx de with flameproof enclosure can
be employed in inverter mode if they are equipped with special winding protection (special design TS15). Standard motors
can be used and operated in inverter mode if the surrounding is not an EX zone and the fan meets certain design demands.
Radial fans of plastic materials
Series VRE direct driven
Technical explanation
Explosions Hazard Avoidance of Category
hazard zone ignition sources acc. to ATEX
continuous zone 0 even in the event of 1
long periods rare incidents
likely zone 1 even in the event of 2
to occur frequent disturbances/faults
infrequently zone 2 during normal operation 3
short period
MIETZSCH Impeller/housing
inside outside
designation without inverter with inverter material
zone 2 zone 2
Z2Z2 EEx e II EEx de not conductive
zone 2 none
Z2Z3 EEx e II standard not conductive
zone 1 zone 1 Z1Z1 EEx e II EEx de conductive
zone 1 zone 2Z1Z2EExeIIEExde conductive
Hazard zo n e
Motor
i_vre_en (09/06)
temperature class T3 (ignition temperature of gas > 200 °C)
explosion group of gases IIB+H2 (IIA and H2included, IIC not included)
constructional safety
category (2G = gases of zone 1, 3G = gases of zone 2)
Equipment-group II (use in mining not permissible)
Zone 1: II 2G c IIB+H2 T3
Zone 2: II 3G c IIB+H2 T3

PERFORMANCE PARAMETERS
All performance parameters are determined on MIETZSCH-own test racks. The design corresponds to DIN 24 163. The
volumetric flow is determined from the differential pressure by means of a measuring nozzle according to EN ISO 5167 .
In cases of radial fans that are destined to be arranged within a plant, the total pressure difference ∆pt results from
∆pt= pt D -pt S = (pstat D +ρ/2 * cD2 ) -( pstat S +ρ/2 * cS2 )
This size corresponds to the usable total pressure losses on the suction side (S) and the pressure side (D).
If area of inlet and outlet are equal total pressure difference is identically to static pressure difference
∆pt= pstatD -pstatS = ∆pstat
In praxis a pressure difference diminished by the dynamic pressure is often used. This size corresponds to the pressure
difference for free blowout ∆pfa which is used for roof fans:
∆pfa = ∆pt -ρ/2 * cD2(to designate it static pressure difference is incorrect)
Duct sound power level LWA
The measuring method for determination of the duct sound power level is specified in DIN 45 635, Part 9. Interpretation is
according to
LWA = Lvalue measuredt +10 * log ( π/ 4 * D2) dB D = diameter of measuring line
Sound pressure level L3m
Several measuring points are arranged on an enveloping surface around the fan. Conversion to the specified level at 3
meters is calculated from
L3m = Lvalue measuredt +20 * log ( rm/ 3m ) dB
EXPLANATION OF TYPE DESIGNATIONS
VRE 250 / 731 W 1450 - TS - GD - 090 L - PE/PPs
Fan (radial, one suction side)
Nominal size (inlet diameter /mm)
Impeller type
731 - curved backward
734 - curved forward
(special disigns of impeller types)
Direct drive
Nominal speed rpm
(higher speed in cases of pole-changing motors)
Brief designation of special versions
E= single-phase drive
TS = with thermal winding protection (thermistor)
P1 = pole-changing motors with speed halving (Dahlander)
such as 1450 P1 = 1450/710 rpm
P2 = pole-changing motors with Separate windings
such as 1450 P2 = 1450/950 U/min (changeover to next smaller speed)
EX = with motor increased safety EEx e II T3
EXde = with motor flameproof enclosure EEx de IIC T4
ZiZo = explosion-proof fan for zone i=inside and o=outside
such as Z1Z2 = inside zone 1 and outside zone 2
GD = gastight (with shaft sealing)
GDS = high gastight casing for humid media with condensate
DD = motor in delta connection for frequency inverter 3x230V
(in case of mounted repair switch)
Housing positions (view from intake side)
Material (casing/impeller)
06
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic materials
Series VRE direct driven
Technical explanation
i_vre_en (09/06)

t
∆p / Pa
Nenngröße100
Bezugsdichte des Förder-
mediums ρ = 1,2 kg/m³
2900 U/min
1450 U/min
950 U/min
710 U/min
160
200
250
315
400
450
500
560
80
100
V / m³/h
.
1000
300
200
∆p / Pa
t
500
400
3000
2000
4000
2900 U/min
1450 U/min
950 U/min
710 U/min
Bezugsdichte des Förder-
mediums ρ = 1,2 kg/m³
Nenngröße100
160
200
250
315
400
10050 2000200 300 1000500 1000050003000 3000020000
10050 2000200 300 1000500 1000050003000 20000 30000 V / m³/h
.
1000
3000
2000
4000
100
400
300
200
500
50
30
450
500
560
SURVEY OF TYPES - PRESELECTION
VRE 731
impeller with backward
curved vanes
direction of rotation left
VRE 734
impeller with forward
curved vanes
direction of rotation left
07
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
All fans are available in direction of rotation L(left)
und R(right) and in 6 different housing positions.
Changing the position of the casing after
manufacturing is complicated. Please consult the
manufacturer.
HOUSING POSITIONS (view from inlet side)
225L
225R
0L
0R 45R
45L 90L
90R
135L
135R
180L
180R
Radial fans of plastic materials
Series VRE direct driven
Technical explanation
i_vre_en (09/06)

1000
0,03
100
3050
0,02
50
0,1
300
0,05
200
0,2
500400
.
.
V / m³/s
V / m³/h
t
∆p / Pa
100
200
300
400
500
1000
1400
ρ = 1,2 kg/m³
2900 U/min
1450
η
=0,75
max
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
Drawings in format dxf
--> MIETZSCH-CD
MOTOR VERSIONS for standard motor 3~400V/50Hz
(Data for other motors, such as single-phase, polechanging or Ex, upon inquiry.)
08
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
PERFORMANCE
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
-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
Radial fans of plastic material
VRE 100 / 731
Impeller with backward curved vanes
power nom. motor nom. motor weight
fan type speed required powe
r
current with moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 100/731W1450 1450 0,0045 0,12 0,42 9,5 45 62 39 43 58 54 54 55 44 37
VRE 100/731W2900 2900 0,035 0,18 0,51 10 51 68 52 60 62 63 61 55 46 36
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_vre_en (09/06)
165
max.570
198
Ø 110
Ø 110 120
205
20
204
144
240
119

09
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
50 200
0,05
0,02
100
0,03
ρ = 1,2 kg/m³
400 500
0,2
300
0,1
1000
∆p / Pa
t
V / m³/h
V / m³/s
.
.
2900 U/min
1450 U/min
max
η
=0,67
1400
1000
200
30
50
100
300
400
500
Radial fans of plastic material
VRE 100 / 734
Impeller with forward 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
- operation with larger volumetric flows
may lead to motor
- parallel and series connection
possible after consultation with the
manufacturers
Design features
- welded impeller with 32 vanes curved
forward
-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 powe
r
current with moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 100/734W1450 1450 0,024 0,12 0,42 10 45 61 42 56 56 53 56 47 39 23
VRE 100/734W2900 2900 0,17 0,18 0,51 10 54 72 57 65 67 63 67 64 51 42
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_vre_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
Drawings in format dxf
--> MIETZSCH-CD
165
max.570
198
Ø 110
Ø 110 120
205
20
204
144
240
119

300
0,050,03
100 200
V / m³/s
0,1 0,30,2 0,50,4
30001000
400 500 2000 V / m³/h
.
.
∆p / Pa
t
0,8
ρ = 1,2 kg/m³
η
=0,78
max
2900 U/min
1450
950
1000
1400
200
30
50
100
300
400
500
10
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 160 / 731
Impeller with backward curved vanes
PERFORMANCE
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
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
-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 powe
r
current with moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 160/731W950 950 0,014 0,09 0,44 17 39 56 39 51 46 48 50 48 33 16
VRE 160/731W1450 1450 0,045 0,12 0,42 17 44 62 44 57 53 55 56 53 43 26
VRE 160/731W2900 2900 0,31 0,37 1,0 19 60 78 57 66 68 77 70 62 59 50
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_vre_en (09/06)
max.810
266
Ø 160
Ø 160
310
192179
274
315
20 332
222

0,03
100
0,05
200
0,3
1000
0,2
0,1
400300 500
.
0,5
2000 3000
1,00,4
V
/ m³/h
V
/ m³/s
.
t
∆p / Pa
ρ = 1,2 kg/m³
η
=0,69
max
2900 U/min
1450
950
1000
2000
60
300
100
200
500
400
3000
11
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 160 / 734
Impeller with forward 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
- operation with larger volumetric flows
may lead to motor
- parallel and series connection
possible after consultation with the
manufacturers
Design features
- welded impeller with 35 vanes curved
forward
-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 powe
r
current with moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 160/734W950 950 0,08 0,09 0,44 18 44 62 43 51 51 59 55 51 40 26
VRE 160/734W1450 1450 0,25 0,25 0,76 19 52 69 54 59 58 64 66 57 50 38
VRE 160/734W2900 2900 2,2 2,2 4,6 29 63 82 59 72 72 76 78 76 70 62
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_vre_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
max.810
266
Ø 160
Ø 160
310
192179
274
315
20 332
222

∆p / Pa
t
3000
0,1 0,30,2 0,50,40,05
300200 1000400 500 2000
V / m³/s
1,0
V / m³/h5000
.
.
710
950
1450
2900 U/min
ρ = 1,2 kg/m³
η
=0,79
max
1400
1000
200
100
50
30
500
400
300
12
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 200 / 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
-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 moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 200/731W710 710 0,016 0,09 0,36 26 40 57 44 49 49 52 49 43 31 22
VRE 200/731W950 950 0,036 0,09 0,55 24 45 63 46 54 54 56 57 54 41 25
VRE 200/731W1450 1450 0,121 0,18 0,58 24 51 69 52 60 61 63 62 59 50 36
VRE 200/731W2900 2900 0,968 1,1 2,40 31 67 85 61 70 75 82 78 69 64 55
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_vre_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
max.855
294
Ø 200
Ø 200
370
240
224
306
365
39520
278

0,3
200 500 1000
0,2
400300
0,1
t
∆p / Pa
V / m³/s
V / m³/h
3000
.
.
1,00,50,4
2000 5000
ρ = 1,2 kg/m³
η
=0,70
max
2900 U/min
1450
950
710
3000
1000
2000
300
200
100
400
500
60
13
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 200 / 734
Impeller with forward 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
- operation with larger volumetric flows
may lead to motor
- parallel and series connection
possible after consultation with the
manufacturers
Design features
- welded impeller with 35 vanes curved
forward
-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 moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 200/734W710 710 0,1 0,12 0,51 32 45 62 48 53 54 57 53 49 56 33
VRE 200/734W950 950 0,2 0,25 0,78 32 50 67 51 56 59 64 58 53 46 35
VRE 200/734W1450 1450 0,85 1,1 2,65 38 59 77 60 65 67 71 72 67 60 48
VRE 200/734W2900 2900 7,2 7,5 14,7 86 75 92 75 82 84 87 88 82 75 63
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_vre_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
max.855
294
Ø 200
Ø 200
370
240
224
306
365
39520
278

1000
0,1 0,2
400 500 .
V / m³/s
0,3 0,50,4 1,0 2,0
2000 50003000
.
V / m³/h
10000300
∆p / Pa
t
η
=0,80
max
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 [phone] 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 moto
r
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_vre_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
415346
332
46025
max.1015
328
Ø 250
Ø 250 280

15
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
2000400300
0,1 0,3 0,50,4
500
0,2
1000
∆p / Pa
t
V
/ m³/s
V
/ m³/
h
.
.
50003000
1,0 1,5
ρ = 1,2 kg/m³
η=0,70
max
1450 U/min
950
710
3000
1000
2000
60
300
100
200
500
400
Radial fans of plastic material
VRE 250 / 734
Impeller with forward 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
- operation with larger volumetric flows
may lead to motor
- parallel and series connection
possible after consultation with the
manufacturers
Design features
- welded impeller with 35 vanes curved
forward
-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 powe
r
current with motor L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 250/734W710 710 0,3 0,37 1,13 43 48 65 50 55 57 64 54 51 47 33
VRE 250/734W950 950 0,73 0,75 2,1 45 53 70 55 58 63 68 58 55 49 39
VRE 250/734W1450 1450 2,67 3,0 6,4 58 62 80 65 69 72 75 76 70 65 53
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_vre_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
415346
332
46025
max.1015
328
Ø 250
Ø 250 280

0,30,2 0,50,4
600 20001000
t
∆p / Pa
2,0 V / m³/s 5,03,0 4,01,0
20000
50003000 10000 V / m³/h
.
.
ρ = 1,2 kg/m³
2900 U/min
1450
950
710
max
η
=0,80
1000
2000
300
100
200
500
400
3000
4000
16
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 315 / 731
Impeller with backward curved vanes
PERFORMANCE
PRINCIPAL DIMENSIONS
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 27.
Number of vibration absorbers : 4
(in case of heavy motors 6)
Drawings in format dxf
--> MIETZSCH-CD
MOTOR VERSIONS for standard motor 3~400V/50Hz
(Data for other motors, such as 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
- welded spiral casing
- 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 moto
r
L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 315/731W710 710 0,139 0,18 0,75 60 48 65 53 59 58 60 58 53 45 38
VRE 315/731W950 950 0,354 0,37 1,2 61 53 71 59 64 65 66 64 60 56 44
VRE 315/731W1450 1450 1,25 1,5 3,45 68 62 80 65 69 75 74 72 67 62 51
VRE 315/731W2900 GfK 2900 10,2 11,0 21,4 144 77 95 81 86 91 90 87 82 76 65
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_vre_en (09/06)
710
max.1155
Ø 315
369
Ø 315
729
376
490
435
60525
353

∆p / Pa
0,2
500
1,0
3000
2000
0,5
1000
0,3 0,4
10000
4,03,0
5000
2,0
t
V / m³/s
V / m³/h
.
.
5,0
20000
ρ = 1,2 kg/m³
η
=0,71
max
1450 U/min
950
710
3000
2000
1000
500
400
300
200
100
60
17
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 315 / 734
Impeller with forward curved vanes
PERFORMANCE
PRINCIPAL DIMENSIONS
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 27.
Number of vibration absorbers : 4
(in case of heavy motors 6)
Drawings in format dxf
--> MIETZSCH-CD
MOTOR VERSIONS for standard motor 3~400V/50Hz
(Data for other motors, such as polechanging or Ex, upon inquiry.)
Working range
- stable regime in entire characteristic
range
- operation with larger volumetric flows
may lead to motor
- parallel and series connection
possible after consultation with the
manufacturers
Design features
- welded impeller with 35 vanes curved
forward
- welded spiral casing
- 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 powe
r
current with motor L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 315/734W710 710 1,12 1,5 3,9 92 55 72 57 60 65 69 64 59 55 43
VRE 315/734W950 950 2,6 3,0 7,2 109 62 78 63 66 71 76 68 63 57 47
VRE 315/734W1450 1450 7,45 7,5 15,1 124 68 87 71 75 77 81 82 76 72 59
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_vre_en (09/06)
710
max.1155
Ø 315
369
Ø 315
729
376
490
435
60525
353

710
950
2,0 5,03,0 4,00,3 0,50,4 1,0
20001000 1000050003000 20000 30000
V / m³/s
.
.
V / m³/h
t
∆p / Pa
ρ = 1,2 kg/m³
1450 U/min
1000
2000
500
100
400
200
300
50
η
=0,80
max
18
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 400 / 731
Impeller with backward curved vanes
PERFORMANCE
PRINCIPAL DIMENSIONS
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 27.
Number of vibration absorbers : 4
(in case of heavy motors 6)
Drawings in format dxf
--> MIETZSCH-CD
MOTOR VERSIONS for standard motor 3~400V/50Hz
(Data for other motors, such as 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
- welded spiral casing
- 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 powe
r
current with motor L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 400/731W710 710 0,46 0,55 1,58 115 55 72 59 65 69 66 62 60 57 53
VRE 400/731W950 950 1,17 1,5 3,9 122 61 79 66 70 76 73 68 65 63 58
VRE 400/731W1450 1450 4,13 5,5 11,4 148 68 86 73 76 84 80 75 72 69 60
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_vre_en (09/06)
830
max.1335
Ø 400
Ø 400
409
720
555 867
446 479
740
40(33)

0,40,3
1000
10,0
30000
2,0
5000
0,5
2000 3000
1,0 3,0
20000
5,04,0
10000
.
V / m³/h
V / m³/s
.
∆p / Pa
t
ρ = 1,2 kg/m³
η
=0,72
max
1450 U/min
950
710
3000
2000
1000
300
100
200
400
500
4000
19
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
Radial fans of plastic material
VRE 400 / 734
Impeller with forward curved vanes
PERFORMANCE
PRINCIPAL DIMENSIONS
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 27.
Number of vibration absorbers : 4
(in case of heavy motors 6)
Drawings in format dxf
--> MIETZSCH-CD
MOTOR VERSIONS for standard motor 3~400V/50Hz
(Data for other motors, such as polechanging or Ex, upon inquiry.)
Working range
- stable regime in entire characteristic
range
- operation with larger volumetric flows
may lead to motor
- parallel and series connection
possible after consultation with the
manufacturers
Design features
- welded impeller with 35 vanes curved
forward
- welded spiral casing
- 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 powe
r
current with motor L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 400/734W710 710 3,9 4,0 10,0 184 62 79 63 65 72 77 72 67 63 52
VRE 400/734W950 950 9,6 11,0 24,5 225 68 85 70 74 78 82 75 71 64 54
VRE 400/734W1450 1450 29,8 30,0 55,0 297 75 93 77 81 84 87 88 83 78 66
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_vre_en (09/06)
830
max.1335
Ø 400
Ø 400
409
720
555 867
446 479
740
40(33)

20
MIETZSCH GmbH Lufttechnik Dresden Großenhainer Str. 137 01129 Dresden Fax [phone] http://www.mietzsch.de
10000
1,00,5 2,0
2000 3000 5000
ρ = 1,2 kg/m³ .
V / m³/h
V / m³/s
10,04,03,0 5,0
3000020000 .
∆p / Pa
t950
710
1450 U/min
2000
1000
60
300
200
100
400
500
3000
η
=0,80
max
Radial fans of plastic material
VRE 450 / 731
Impeller with backward curved vanes
PERFORMANCE
PRINCIPAL DIMENSIONS
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 27.
Number of vibration absorbers : 4
(in case of heavy motors 6)
Drawings in format dxf
--> MIETZSCH-CD
MOTOR VERSIONS for standard motor 3~400V/50Hz
(Data for other motors, such as 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 1450rpm with FRP-impeller
- welded spiral casing
- 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 powe
r
current with motor L
A3m
L
WA
rpm kW kW A kg dB(A) dB(A) 63 125 250 500 1000 2000 4000 8000
VRE 450/731W710 710 0,87 1,1 2,9 162 57 75 62 68 72 69 65 63 60 56
VRE 450/731W950 950 2,08 2,2 5,2 167 63 81 68 72 78 75 70 67 65 60
VRE 450/731W1450 GfK 1450 7,48 7,5 15,1 196 72 90 77 80 88 84 79 76 73 64
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_vre_en (09/06)
884
max.1375
Ø 450
Ø 450
454
974624
790
503
845
539
40(33)