Lindab DRU User guide

Mounting instruction
lindab
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construction
Dampers
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU
TASU, TATU, TATBU, LKSR
DAU, DA2EU, DAVU, CARU, CAR, MBU, MBFU
FMU, FMDRU, FMDU, DIRU, DIRBU, DIRVU
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU

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Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
Assembly
In order to fulfil the requirements for air-tightness class D, the dampers must be installed as per ‘Assembly
Instruction Lindab Safe’.
For certain manual dampers, there is the option of adding a motor later on.
The dampers allow 50 mm duct insulation without the knob being hidden. For 100 mm duct insulation, there
is an insulation cup, IK, for DRU, DSU, DTU, TASU and TATU.
PSDRU, TDRU and TDSU
The dampers are installed by inserting the two guide pins on the T-piece or saddle into the L-shaped slots on
the dampers. The dampers are then locked by turning them slightly clockwise.
Balancing
On DRU, PSDRU and TDRU the damper blade is stepless adjustable through 0–90° (0°=fully open, 90°=com-
pletely closed) using the knob in the cup. Locking is performed using screws for Pozidrive (PZD2) and the
damper angle can be read off a stamped grade on the edge of the cup. Other types of damper normally only
work in the fully open or completely closed positions.
On motorized shut-off dampers and dampers adapted for a motor, the shaft end for the motor is equipped
with a notch showing the position of the damper blade.
Manual dampers Ø <355 can be supplemented with a sturdy handle to facilitate adjustment. Larger dimen-
sions are equipped with a handle as standard.
Maintenance
Dampers and motors normally don't require any maintenance.
CE marking
Our dampers with electrical actuator are regarded as a component in the duct system and does not need to
be CE marked separately.
Their electrical actuators on the other hand are part of the electrical system and are CE marked. Declaration
of compliance with the essential requirements can be found at www.belimo.ch .

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Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
CM 24 F CM 230 F
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 65–265 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 0,5 W 1,5 W
For wire sizing ........................... 1 VA 3 VA
Connection ................................ Cable 1 m, 3×0,75 mm2 Cable 1 m, 3×0,75 mm2
Operating angle......................... Continously rotating Max. 95°, adjustable 0–100%
Torque at rated voltage.............. Min. 2 Nm Min. 2 Nm
Direction of rotation................... -L or -R -L or -R
Position indication..................... Mechanical, removable Mechanical, removable
Running time for 95° ................. 75 s 75 s
Sound power level..................... Max. 35 dB (A) Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RF 95 % RF
–+
123
L
R
–+
12
0
3
L
R
GM 24 A GM 230 A
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 85–265 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 4,5 W 4,5 W
For wire sizing ........................... 7 VA 7 VA
Connection ................................ Cable 1 m, 3×0,75 mm2 Cable 1 m, 3×0,75 mm2
Operating angle......................... Max. 95°, adjustable 0–100% Max. 95°, adjustable 0–100%
Torque at rated voltage.............. Min. 40 Nm Min. 40 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 95° ................. 150 s 150 s
Sound power level..................... Max. 45 dB (A) Max. 45 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH
–+
123
0
1
–+
12
0
3
0
1
LF 24 LF 230
Power supply............................. 2AC 19,2–28,8 V, 50/60 Hz AC 198–264 V, 50/60 Hz
DC 21,6–28,8 V
Power consumption
– during opening........................ 5 W 5 W
– stand-by ................................. 2,5 W 3 W
For wire sizing ........................... 7 VA 7 VA
Connection ................................ Cable 1 m, 2×0,75 mm² Cable 1 m, 2×0,75 mm²
Operating angle, adjustable ...... Mech. limited to 95° Mech. limited to 95°
Torque at rated voltage
– motor ...................................... Min. 4 Nm Min. 4 Nm
– return spring ........................... Min. 4 Nm Min. 4 Nm
Direction of rotation................... Optional through right or Optional through right or
left-hand installation L/R left-hand installation L/R
Position indication..................... Mechanical Mechanical
Running time
– motor ...................................... 40–75 s (0–4 Nm) 40–75 s (0–4 Nm)
– return spring ........................... app. 20 s app. 20 s
Sound power level
– motor ...................................... max 50 dB (A) max 50 dB (A)
– return spring ........................... app. 62 dB (A) app. 62 dB (A)
Degree of protection.................. IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
1
NL1
2
M

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Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
LM 24 A-F LM 230 A-F
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 65–265 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 1 W 1,5 W
For wire sizing ........................... 2 VA 4 VA
Connection ................................ Cable 1 m, 3×0,75 mm² Cable 1 m, 3×0,75 mm²
Operating angle......................... Max. 95°, adjustable 0–100% Max. 95°, adjustable 0–100%
Torque at rated voltage.............. Min. 5 Nm Min. 5 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 95° ................. 150 s 150 s
Sound power level..................... Max. 35 dB (A) Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH
–+
123
0
1
–+
12
0
3
0
1
LM 24-SR LM 230-SR
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 230 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 1 W 1,8 W
For wire sizing ........................... 2 VA 4 VA
Connection ................................ Cable 1 m, 4×0,75 mm² Cable 1 m, 2×0,75 mm²
Operating angle......................... Max. 95°, adjustable Max. 95°, adjustable
Torque at rated voltage.............. Min. 5 Nm Min. 5 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 95° ................. 150 s 150 s
Sound power level..................... 35 dB (A) 35 dB (A)
Protection class......................... III Safety extra-low voltage II
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH
–+
123
0
1
–+
12
0
3
0
1
LM 24 A-SR
Power supply............................. AC 24 V, 50/60 Hz
DC 24 V
Power consumption .................. 1 W
For wire sizing ........................... 2 VA
Connection ................................ Cable 1 m, 4×0,75 mm²
Operating angle......................... Max. 95°, adjustable 0–100%
Torque at rated voltage.............. Min. 5 Nm
Direction of rotation................... Switch selectable
0 or 1
Position indication..................... Mechanical
Running time for 95°.................. 150 s
Sound power level..................... Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage
Protection type.......................... IP 54
Ambient temperature range ...... -30 to +50°C
Ambient moisture ...................... 95 % RF
–+
1235
U
Y DC 0–10 V
DC 2–10 V

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Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
–+
123
0
1
–+
12
0
3
0
1
NM 24 A-F NM 230 A-F
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 85–265 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 1,5 W 2,5 W
For wire sizing ........................... 3,5 VA 6 VA
Connection ................................ Cable 1 m, 3×0,75 mm2 Cable 1 m, 3×0,75 mm2
Operating angle......................... Max. 95°, adjustable 0–100% Max. 95°, adjustable 0–100 %
Torque at rated voltage.............. Min. 10 Nm Min. 10 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 95° ................. 150 s 150 s
Sound power level..................... Max. 35 dB (A) Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH
LMQ 24A LMQ-SR 24A
Power supply............................. AC 19,2-28,8 V, 50/60 Hz AC 19,2-28,8 V, 50/60 Hz
................................................... DC 21,6-28,8 V DC 21,6-28,8 V
Power consumption .................. 13 W 12 W
For wire sizing ........................... 23 VA 23 VA
Connection ................................ Cable 1 m, 3×0,75 mm² Cable 1 m, 4×0,75 mm²
Operating angle......................... Max. 95°, adjustable 0-100 % Max. 95°, adjustable 0-100 %
Torque at rated voltage.............. Min. 4 Nm Min. 4 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 90° ................. 2,5 s 2,5 s
Sound power level..................... 52 dB (A) 52 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +40°C -30 to +40°C
Ambient moisture ...................... 95 % RH 95 % RH
–+
123
0
1
–+
1235
U
Y DC 0–10
V
DC 2–10
V
LM 24 A-SX
Power supply............................. AC 19,2–28,8 V, 50/60 Hz
DC 21,6–28,8 V .........................
Power consumption .................. 2 W
For wire sizing ........................... 4 VA
Connection ................................ Cable 1 m, 4×0,75 mm2
Operating angle......................... Max. 95°, adjustable 0–100 %
Torque at nominal voltage ......... Min. 5 Nm
Direction of rotation................... Switch selectable 0/1
Position at Y=0 V....................... Switch selectable 0 or 1
Position indication..................... Mechanical
Running time for 90° ................. 150 s
Sound power level..................... 35 dB (A)
Protection class......................... III Safety extra-low voltage
Protection type.......................... IP 54
Ambient temperature range ...... -30 to +50 °C
Ambient humidity ...................... 95 % RH
–+
1235
U
Y DC 0–10 V
DC 2–10 V

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SF 24A SF 230A
Voltage range ............................ AC 19,2–28,8 V, 50/60 Hz AC 195–264 V, 50/60 Hz
DC 21,6–28,8 V
Power consumption
– during operation ..................... 5 W 6,5 W
– stand-by ................................. 2,5 W 3,5 W
For wire sizing ........................... 7,5 VA 18 VA
Connection ................................ Cable 1 m, 2×0,75 mm² Cable 1 m, 2×0,75 mm²
Operating angle, adjustable ...... Mech. limited to 95° Mech. limited to 95°
Torque at rated voltage
– motor ...................................... Min. 20 Nm Min. 20 Nm
– spring bias .............................. Min. 20 Nm Min. 20 Nm
Direction of rotation................... Optional through right or Optional through right or
left-hand installation L/R ........... left-hand installation L/R
Position indication..................... Mechanical Mechanical
Running time
– motor ...................................... ≤ 75 s ≤75 s
– return spring ........................... ≤20 s ≤20 s
Sound power level
– motor ...................................... ≤45 dB (A) ≤45 dB (A)
– return spring ........................... ≤62 dB (A) ≤62 dB (A)
Degree of protection.................. IP 54 IP 54
Ambient temperature range ...... -30 to +50 °C -30 to +50 °C
Ambient temperature range ...... -30 to +50 °C -30 to +50 °C
1
NL
2
M
Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
–+
123
0
1
–+
12
0
3
0
1
SM 24 A SM 230 A
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 85–265 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 2 W 2,5 W
For wire sizing ........................... 4 VA 6 VA
Connection ................................ Cable 1 m, 3×0,75 mm2 Cable 1 m, 3×0,75 mm2
Operating angle......................... Max. 95°, adjustable 0–100% Max. 95°, adjustable 0–100%
Torque at rated voltage.............. Min. 20 Nm Min. 20 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 95° ................. 150 s 150 s
Sound power level..................... Max. 35 dB (A) Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH

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TF 24 TF 230
Voltage range ............................ 2AC 19,2–28,8 V, 50/60 Hz AC 85–265 V, 50/60 Hz
DC 21,6–28,8 V
Power consumption
– during opening........................ 2,5 W 2,5 W
– stand-by ................................. 1,5 W 1,5 W
For wire sizing ........................... 5 VA 5 VA
Connection ................................ Cable 1 m, 2×0,75 mm² Cable 1 m, 2×0,75 mm²
Operating angle, adjustable ...... Mech. limited to 95° Mech. limited to 95°
Torque at rated voltage
– motor ...................................... Min. 2 Nm Min. 2 Nm
– return spring ........................... Min. 2 Nm Min. 2 Nm
Direction of rotation................... Optional through right or Optional through right or
left-hand installation L/R ........... left-hand installation L/R
Position indication..................... Mechanical Mechanical
Running time
– motor ...................................... < 75 s (0–2 Nm) < 75 s (0–2 Nm)
– return spring ........................... < 25 s < 25 s
Degree of protection.................. IP 42 IP 42
Ambient temperature range ...... -30 to +50°C -30 to +50°C
1
NL1
2
M
CM 24 CM 230
Power supply............................. AC 24 V, 50/60 Hz AC 100–240 V, 50/60 Hz
DC 24 V
Power consumption .................. 0,5 W 1,5 W
For wire sizing ........................... 1 VA 3 VA
Connection ................................ Cable 1 m, 3×0,75 mm² Cable 1 m, 3×0,75 mm²
Torque at rated voltage.............. Min. 2 Nm Min. 2 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Running time for 95° ................. 75 s 75 s
Sound power level..................... Max. 35 dB (A) Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage II
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH
CM 24 SR
Power supply............................. AC 24 V, 50/60 Hz
DC 24 V
Power consumption .................. 0,5 W
For wire sizing ........................... 2 VA
Connection ................................ Cable 1 m, 4×0,75 mm²
Torque at rated voltage.............. Min. 2 Nm
Direction of rotation................... Switch selectable 0 or 1
Running time for 95° ................. 75 s
Sound power level..................... Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage
Protection type.......................... IP 54
Ambient temperature range ...... -30 to +50°C
Ambient moisture ...................... 95 % RH
Dampers
DRU, DSU, DTU, DTHU, DTH1U, DTH2U, DTBU,
DTBCU, DTFU, DTBLU, DSUSN, DSVUSN, DTPU,
PSDRU, TDRU, TDSU, TASU, TATU, TATBU
–+
1235
U
Y DC 0–10 V
DC 2–10 V
–+
123
0
1
–+
12
0
3
0
1

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Assembly
In order to fulfil the requirements for air-tightness class C, the damper must be installed as per ‘Assembly
Instruction Rectangular air duct systems’.
For the damper, there is the option of adding a motor later on.
The damper allows a 50 mm duct insulation without the knob being hidden. For 100 mm insulation, an
insulation cup, IK, is available.
Balancing
On LKSR the damper blade is adjusted through 0–90° (0° = fully open, 90° = completely closed) using the
knob in the cup. Locking is performed using screws for Pozidrive (PZD2) and the damper angle can be
read off a stamped grade on the edge of the cup.
Manual damper can be supplemented with a sturdy handle to facilitate adjustment.
Maintenance
The damper and motor normally don't require any maintenance.
Dampers
LKSR

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Constant/variable flow dampers
DAU, DA2EU, DAVU
Assembly
In order to fulfil the requirements for air-tightness class D, the devices must be installed as per ‘Assembly
Instruction Lindab Safe’.
The devices must be installed with the air flow in the direction of the arrow.
The devices allow 50 mm duct insulation without the scale or any motor being hidden.
Pressure range
50–1000 Pa over the unit.
Interference sensitivity
In order to achieve stated precision for the set flow, a straight duct of at least 3×d before and 1.5×d after
the devices is required. A assembly close to a source of interference (bend, saddle, etc.) reduces control
accuracy and the flow can deviate from the set value.
Changes in direction
The units are independent of their direction of installation; you can deviate from the projected direction
and install them in any direction you like without affecting accuracy.
Systematic error
Control accuracy
The devices are calibrated within their entire operating range at the factory. This means the devices keep
the flow constant to within approx. ±5 to ±10 % of the set flow. Larger deviations occur at lower flows,
especially with small sizes.
Maintenance
The devices normally don't require any maintenance, but should be protected from contaminated air
wherever possible.
CE marking
Our dampers with electrical actuator are regarded as a component in the duct system and does not need
to be CE marked separately.
Their electrical actuators on the other hand are part of the electrical system and are CE marked. Declara-
tion of compliance with the essential requirements can be found at www.belimo.ch .
Balancing
DAU
The flow is adjusted by loosening the central nut and using the knob to turn the scale arrow so that it
points to the desired flow on the scale. The nut is then locked.
Scale arrow
Center nut

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DA2EU
Setting of flows
The two flows are set by moving the end stops. At delivery the stops are set at
largest possible distance. If you want to limit the flow span proceed in the fol-
lowing way:
1. The one flow is set by turning the spindle so that the scale arrow points at the
desired flow and thereafter move one of the end stops close up to the clamp's
one heel and lock the stop there.
2. The other flow is set by turning the spindle so that the scale arrow points at
this flow and thereafter move the other end stop close up to the clamp's other
heel and lock this stop there.
Choice of flows
The one flow is chosen by feeding an operating voltage. This voltage, 24 or 230
V, turns the motor to one of the stops.
The other flow is chosen by breaking the operating voltage. The motor then goes
to the other stop.
Technical data for the motors
LM 24 A LM 230 A
Power supply............................. AC 19,2–28,8 V, 50/60 Hz AC 65–265 V, 50/60 Hz
DC 19,2–28,8 V
Power consumption .................. 1 W 1,5 W
For wire sizing ........................... 2 VA 4 VA
Connection ................................ Cable 1 m, 3×0,75 mm2 Cable 1 m, 3×0,75 mm2
Operating angle......................... Max. 95°, adjustable 0–100% Max. 95°, adjustable 0–100%
Torque at rated voltage.............. Min. 5 Nm Min. 5 Nm
Direction of rotation................... Switch selectable Switch selectable
0 or 1 0 or 1
Position indication..................... Mechanical Mechanical
Running time for 95° ................. 150 s 150 s
Sound power level..................... Max. 35 dB (A) Max. 35 dB (A)
Protection class......................... III Safety extra-low voltage II Safety insulated
Protection type.......................... IP 54 IP 54
Ambient temperature range ...... -30 to +50°C -30 to +50°C
Ambient moisture ...................... 95 % RH 95 % RH
–+
123
0
1
–+
12
0
3
0
1
BELIMO
End stop screws
Made n Swi ze land
LM230A
0
1
Constant/variable flow dampers
DAU, DA2EU, DAVU

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Constant/variable flow dampers
DAU, DA2EU, DAVU
DAVU
Setting of flow limits
The two flow limits are set by moving the end stops. At
delivery the stops are set at largest possible distance. If
you want to limit the flow span proceed in the following
way:
1. The one flow limit is set by turning the spindle so
that the scale arrow points at the desired flow and
thereafter move one of the end stops close up to the
clamp's one heel and lock the stop there.
2. The other flow limit is set by turning the spindle so
that the scale arrow points at this flow and thereafter
move the other end stop close up to the clamp's
other heel and lock this stop there.
3. The motor shall then be adapted so that the regulat-
ing span 2–10 V adapts to the thus set flow span.
This is done by a push on the "gear disengagement"
button. The motor then automatically performs a
stroke between the flow limits.
Choice of flow
The flow is chosen by feeding a control signal. This
signal, 2–10 V, sets the motor in a proportional position
between the flow limits.
BELIMO
Made in Sw t er and
LM24 A SX
0
1
End stop screws
Technical data for the motor
LM 24 A-SX
Power supply............................. AC 19,2–28,8 V, 50/60 Hz
DC 21,6–28,8 V
Power consumption .................. 2 W
For wire sizing ........................... 4 VA
Connection ................................ Cable 1 m, 4×0,75 mm²
Operating angle......................... Max. 95°, adjustable 0–100 %
Torque at nominal voltage ......... Min. 5 Nm
Direction of rotation................... Switch selectable 0/1
Position at Y=0 V....................... Switch selectable 0 or 1
Position indication..................... Mechanical
Running time for 90° ................. 150 s
Sound power level..................... 35 dB (A)
Protection class......................... III Safety extra-low voltage
Protection type.......................... IP 54
Ambient temperature range ...... -30 to +50 °C
Ambient humidity ...................... 95 % RH
–+
1235
U
Y DC 0–10 V
DC 2–10 V

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Air stream operated dampers
CARU, CAR
Assembly
CARU
In order to fulfil the requirements of tightness class D the damper must be installed as per ‘Assembly
Instruction Lindab Safe’.
CAR
The damper is installed by simply placing it inside a duct.
Measurement
The dampers normally don’t need any maintenance.

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Measuring bends
MBU, MBFU
Assembly
In order to fulfil the requirements for air-tightness class D, the bends must be installed as per ‘Assembly
Instruction Lindab Safe’.
The bends allow 50 mm duct insulation without the measuring points being hidden. For 100 mm insula-
tion, an insulation cup, IK, is available.
Measurement
By measuring the pressure difference Δp in Pa at the measuring points, you can achieve a flow q in l/s
using the equation on the devices.
The specified flows only apply for air with a density of 1.2 kg/m3. For air of another density (ρother) the flow
(qother_density) is achieved as per the formula:
qother_density = qequation ×
Device Dimension
mm k-factor
MBU
100 6.85
125 10.3
160 17.0
200 26.3
250 41.7
MBFU
315 65.0
400 115
500 179
630 283
Systematic error
Straight stretches are required in order to achieve flows as per equations with specified accuracy. The
systematic error m2is 5% and 10% below the minimum requirements for straight stretches as specified.
Maintenance
The measuring bends normally don't require any maintenance.
Cleaning
The device does not limit cleaning opportunities.
ρother
1,2

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Assembly
In order to fulfil the requirements for air-tightness class D, the devices must be installed as per ‘Assembly
Instruction Lindab Safe’.
FMDRU must be installed with the air flow in the direction of the arrow.
The devices allow 100 mm duct insulation without sticker or measuring points being hidden. The cup
around FMDRU’s damper knob allows 50 mm duct insulation without the knob being hidden. For 100 mm
insulation, an insulation cup, IK, is available.
For optimum readability (regardless of the installation position), the plate with the sticker can be turned,
folded up to prevent it disappearing in any insulation or to be easily removed and positioned separately
from the device.
Measurement
By measuring the pressure difference Δp in Pa at the measuring points, you can achieve a flow q in l/s
using the equation on the devices.
With FMDRU you can set the desired flow, as the damper blade is adjustable through 0–90° (0°=fully
open, 90°=completely closed) using the knob in the cup. Locking is performed using screws for Pozidrive
(PZD2) and the damper angle can be read off a stamped grade on the edge of the cup.
The specified flows only apply for air with a density of 1.2 kg/m3. For air of another density (ρother) the flow
(qother_density) is achieved as per the formula:
qother_density = qequation ×
Dimension
mm
k-factor
80– 63 4.40
100– 80 7.32
125–100 11.2
160–125 18.0
200–160 29.4
250–200 45.7
315–250 73.3
400–315 116
500–400 191
630–500 283
Systematic error
Straight stretches are required in order to achieve flows as per equations with specified accuracy. The
systematic error m2is 5% and 10% below the minimum requirements for straight stretches as specified.
For these minimum straight requirements – do not install measuring points in line with the nearest bend’s
inside radius.
Maintenance
The devices normally don't require any maintenance.
Cleaning
FMU does not limit cleaning opportunities.
Flow meters
FMU, FMDRU
ρother
1,2

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Assembly
In order to fulfil the requirements for air-tightness class D, the device must be installed as per ‘Assembly
Instruction Lindab Safe’.
The device must be installed with the air flow in the direction of the arrow.
The device allows 50 mm duct insulation without sticker or measuring points being hidden.
The cup around the damper knob allows 50 mm duct insulation without the knob being hidden. For 100
mm insulation, an insulation cup, IK, is available.
For optimum readability (regardless of the installation position), the plate with the sticker can be turned or
easily removed and positioned separately from the device.
Measurement
By measuring the pressure difference Δp in Pa at the measuring points, you can achieve a flow q in l/s
using the equation on the device.
You can set the desired flow, as the damper blade is adjustable through 0–90° (0°=fully open, 90°=com-
pletely closed) using the knob in the cup. Locking is performed using screws for Pozidrive (PZD2) and the
damper angle can be read off a stamped grade on the edge of the cup.
The specified flows only apply for air with a density of 1.2 kg/m3. For air of another density (ρother) the flow
(qother_density) is achieved as per the formula:
qother_density = qequation ×
Dimension
mm k-factor
Colour coding
for measuring
points
80 2.99 transparent
100 4.90 red
125 7.95 green
160 13.8 yellow
200 21.3 blue
250 34.6 black
315 57.8 white
400 88.8 transparent
500 146 red
630 234 green
Systematic error
Straight stretches are required in order to achieve flows as per equations with specified accuracy. The
systematic error m2is 5% and 10% below the minimum requirements for straight stretches as specified.
Maintenance
The device normally doesn't requires any maintenance.
Flow meters
FMDU
ρother
1,2

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Assembly
Mount the dampers according to “Assembly Instructions Lindab Safe” to meet with the requirements for
tightness class C.
Consider required straight distance after or before disturbance, as mentioned on the card attached to the
measurement nozzles, to obtain accurate flow measurement. Dampers with dimension 400, 500 and 630
are provided with transport protections. Remove these before assembly.
The damper may not be loaded with weight from connected ducts, specially when assembled vertically.
Measuring
Measurement accuracy
Consider required straight distance after or before disturbance, as mentioned on the card attached to the
measurement nozzles, to obtain accurate flow measurement.
Balancing
Connect the measuring hoses to the damper measuring nozzles.
Loosen the locking screws (3), which have Philips slot no.1. adjust the handle so that requisited pressure
drop receives. Fasten the screws (3) and remount the tightness screws (2), so that the slot gets airtight.
For dimension 400,500 and 630 - remove the tightness screws (2). Then loosen the locking screws (3),
which have Philips slot no. 2. Adjust the handle so that requisited pressure drop receives. Fasten the
screws (3) and remount the tightness screws (2), so that the slot gets airtight.
Disconnect the hoses and plug the nozzles.
Maintenance
The product normally doesn't requires any maintenance.
Cleaning
By fully open the damper, one get access to the duct. Do not forget to readjust the damper after cleaning.
The balancing graphs show the flow, q, as a function of the measured pressure, Δpm, in the measure
nozzles.
The formula is only accurate for air with the density 1,2 kg/m³. For air with other density, (ρother), the flow,
(qother), is given according to the formula.
qother= qequation × ρother
1,2
The balancing graphs should only be used to balance the system. They should not be used to calculate
the pressure drop in the system, in those cases the dimensioning graphs should be used.
Measuring pressure Δpm
Damper with flow meter
DIRU
q=k · Δpm

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To set the air flow (method 2):
• Calculate the pressure difference
by using the formula,
Δpm=
• Measure the pressure difference by
connecting a measuring device to
the dampers nozzles, Δpm
• Compare the measured pressure
difference to the required
• Adjust the damper
Don’t forget to plug the nozzles after measuring.
To set the air flow (method 1):
• Determine the k factor on the scale
on the
damper, k
• Measure the pressure difference by
connecting a measuring device to the
damper nozzles, Δpm
• Calculate the flow by using the
formula, q=k · Δpm
• Compare the calculated flow to the
required
• Adjust the damper if necessary and
recalculate the pressure difference
When using this method you will have to recalculate
until you receive the required flow. By using a diffe-
rent method you will only have to do one calculation.
Damper with flow meter
DIRU, DIRBU, DIRVU
2
2
3
3
1

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15 20 30 40 50 100
q
10
20
30
40
50
100
200
300
Δp
m
k
[m/s]
[l/s]
[Pa]
2345 10
v
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
5,5
6,0
Ø100
20
30
50
100
200
300
500
[Pa]
Δpt
Ø100
10
8 20 30 40 50 120100 [l/s]
[m/s]
q
v
k
123451015
1,5 2,0 2,5 3,0 3,5 4,0
4,5
5,0
5,5
6,0
40
45
50
55
60
65
70
75
85
80
L
WA
[dB]
25 30 40 50 100 150
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
345 10
v
1,5
2,0
3,0
4,0
5,0
6,0
7,0
8,0
9,0
10
Ø125
20
30
50
100
200
300
500
[Pa]
Δpt
Ø125
15
12 20 30 40 50 180100 [l/s]
[m/s]
q
v
k
123451015
1,5 2,0 3,0 4,0 5,0
6,0
7,0
8,0
9,0
10,0
40
35
45
50
55
60
65
70
LWA [dB]
q
1510 20 30 40 50 60
10
20
30
40
50
100
200
300
v11109876
5432
[Pa]
[l/s]
[m/s]
Δpm
k
Ø80
1,5
1,0
2,0
2,5
3,0
3,5
4,0
20
30
50
100
200
300
500
[Pa]
Δpt
Ø80
10
52030405075
[l/s]
[m/s]
q
v
k
123451015
1,51,0 2,0 2,5
3,0
3,5
4,0
40
35
45
50
55
60
65
70
75
80
85 90
LWA [dB]
Flow graphs for balancing
The balancing graphs show the flow as a function of
the measured pressure, Δpm. These graphs should
be used to balance the system.
Pressure drop graphs with noise
generation for dimensioning
The dimensioning graphs show the pressure drop over
the damper with flow meter, Δpt. They should be used
to determine the pressure drop and to provide infor-
mation about sound power levels at different settings.
Damper with flow meter
DIRU, DIRBU, DIRVU

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35 40 50 100 150 200
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
2345 10
v
3,5
4,0
5,0
6,0
7,0
8,0
9,0
10
12
15
Ø150
20
30
50
100
200
300
500
[Pa]
Δpt
Ø150
20 30 40 50 260100 200 [l/s]
[m/s]
q
v
k
123451015
43,5 5 678
9
10
12
15
40
35
30
45
50
55
60
65
70
L
WA
[dB]
40 50 250100 150 200
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
2345 10
v
3,5
4,0
5,0
6,0
7,0
8,0
10
9,0
12
15
16
Ø160
20
30
50
100
200
300
500
[Pa]
Δpt
Ø160
20 30 40 50 300100 200 [l/s]
[m/s]
q
v
k
123451015
5
4
3,5 678910
12
15
16
40
30
35
45
50
55
60
65
70 75
80
85
90
LWA [dB]
60 400300100 150 200
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
2345 10
v
7,0
8,0
9,0
10
12
15
20
25
29
Ø200
20
30
50
100
200
300
500
[Pa]
Δpt
Ø200
30 40 50 475100 200 300 [l/s]
[m/s]
q
v
k
123451015
78
91012 15
20
25
29
40
35
30
45
50
55
60
65
70
75
L
WA
[dB]
Flow graphs for balancingPressure drop graphs with noise
generation for dimensioning
Damper with flow meter
DIRU, DIRBU, DIRVU

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100 600400 500150 200 300
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
345 10
v
8
10
12
15
20
25
30
35
40
45
Ø250
20
30
50
100
200
300
500
[Pa]
Δpt
Ø250
50 100 200 300 740500 [l/s]
[m/s]
q
v
k
123451015
810121520
25
30
35
40
45
40
35
30
45
50
55
60
85
80
75
70
65
L
WA
[dB]
150 900200 300 400 500
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
345 10
v
14
15
20
25
30
35
40
50
60
65
Ø300
20
30
50
100
200
300
500
[Pa]
Δpt
Ø300
100
70 200 300 500 1060 [l/s]
[m/s]
q
v
k
123451015
15 20 25 30 35
40
50
60
65
35
30
40
45
50
55
60
65
70
LWA [dB]
150 1000200 300 400 500
q
10
20
30
40
50
100
200
300
Δpm
k
[m/s]
[l/s]
[Pa]
324510
v
13
15
20
25
30
35
40
50
70
60
75
Ø315
20
30
50
100
200
300
500
[Pa]
Δpt
Ø315
100
80 200 300 500 1170 [l/s]
[m/s]
q
v
k
123451015
13 15 20 25 30
40
50
60
70
75
30
35
45
50
55
60
65
40
L
WA
[dB]
Flow graphs for balancingPressure drop graphs with noise
generation for dimensioning
Damper with flow meter
DIRU, DIRBU, DIRVU