The Halton Max MLC airflow management damper can be installed without safety distances in all installation cases!
It can operate either in duct static pressure control mode or duct airflow control mode depending on chosen control unit. The airflow management damper is designed to function also at very low air velocity and pressure.
The Halton Max MLC airflow management damper is particularly suitable for demand-based office applications.
The Halton Max MLC airflow management damper can be installed without safety distances in all installation cases. It can operate either in duct static pressure control mode or duct airflow control mode depending on chosen control unit. The airflow management damper is designed to function also at very low air velocity and pressure.
Fig.1. Halton Max MLC, airflow direction
The damper contains airflow measurement with orifice plate, a VAV airflow controller, an actuator and a blade with gasket. Depending on the actuator model, the VAV controller is a separate unit or integrated into the actuator.
The damper can operate either as a supply or an exhaust unit. It maintains the required airflow level or pressure level through static pressure measurement. For ductwork static pressure control, static pressure measurement unit (MSS) with pressure transmitter is used for zone ductwork static pressure measurement.
Changes in room conditions can be adjusted manually from an end-user interface or by different sensors such as occupancy or room pressure sensors, thermostats or timers. The conditions can also be managed remotely from a building management system (BMS). The control signal and the airflow measurement data from the pickup tubes are processed in the VAV controller. The VAV controller gives the actuator a command to change the position of the damper blade, in order to keep the airflow at the predefined setpoint.
The airflow setpoint can be modified between minimum and maximum settings from the room controller interface or a BMS. The VAV controller can also send actual value data back to the room interface controller. The communication protocol used for the signal between the room control interface and the VAV controller depends on the actuator model.
For more information about the available actuator models, see section Control units.
Feature | Value |
Duct connection sizes | ø125-250 mm |
Material | Galvanised steel |
Air velocity range |
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Operating range (ambient temperature) | 0-50 ℃ |
Ambient relative humidity (non-condensing) | < 95% |
Operating modes
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Accessories |
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Standards and certifications |
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The operable airflow range for Halton Max MLC corresponds to duct air velocities 0.5-6 m/s.
The below example shows the airflow ranges and noise levels with damper blade fully open.
No. | Part | Material |
1 | Blade gasket | EPDM rubber |
2 | Shaft | Galvanised steel |
3 | Blade | Galvanised steel |
4 | Duct seal gasket | Rubber |
5 | Actuator | Plastic, steel, PVC cable |
6 | Casing | Galvanised steel |
7 | Orifice plate gasket | EPDM rubber |
8 | Orifice plate | Galvanised steel |
9 | Tube connectors | Polyacetal |
10 | Measurement tabs | Polyurethane |
A range of control units are available for various application needs.
All control units include an integrated dynamic differential pressure sensor with a low bypass airflow rate through the sensor element. Therefore not to be used in highly contaminated environments. Airflow rate limits are set at the factory.
Controller | Notes | Torque Nm |
Damper size |
Communication interface |
Order code |
Halton EM |
Analogue controller Manufacturer: Belimo |
5 | 100-250 | DC0..10V/ 2..10V |
EM = LMV-D3-MF-F.1 HI (DC 0/2…10 V), 5 Nm |
Halton EK |
Analogue controller Manufacturer: Belimo |
10 | 100-630 | DC0..10V/ 2..10V |
EK = NMV-D3-MF-F.1 HI (DC 0/2…10 V), 10 Nm |
Halton EC |
Controller with NFC connectivity for mobile onsite parameter adjustment (Belimo Assistant App). Analogue or MPbus. Manufacturer: Belimo |
5 | 100-250 | Belimo MP bus or 0..10V/2..10V |
EC = LMV-D3-MP (MP bus), 5 Nm |
Halton EE |
Controller with NFC connectivity for mobile onsite parameter adjustment (Belimo Assistant App). Analogue or MPbus. Manufacturer: Belimo |
10 | 100-630 | Belimo MP bus or 0..10V/2..10V |
EE = NMV-D3-MP (MP bus), 10 Nm |
Halton ER |
Controller with KNX Manufacturer: Belimo |
5 | 100-250 | KNX | ER = LMV-D3-KNX (KNX bus), 5 Nm |
Halton ES |
Controller with KNX Manufacturer: Belimo |
10 | 100-630 | KNX | ES = NMV-D3-KNX (KNX bus), 10 Nm |
Halton ET |
Controller with Modbus Manufacturer: Belimo |
5 | 100-250 | Modbus | ET = LMV-D3-MOD (Modbus RTU), 5 Nm |
Halton EU |
Controller with Modbus Manufacturer: Belimo |
10 | 100-630 | Modbus | EU = NMV-D3-MOD (Modbus RTU), 10 Nm |
Halton EH |
Analogue controller Manufacturer: Siemens |
5 | 100-250 | DC0..10V/ 2..10V |
EH = GDB181.1E/3 (DC 0/2…10 V), 5 Nm |
Halton EG |
Analogue controller Manufacturer: Siemens |
10 | 100-630 | DC0..10V/ 2..10V |
EG = GLB181.1E/3 (DC 0/2…10V), 10 Nm |
Halton EV |
Controller with KNX Manufacturer: Siemens |
5 | 100-250 | KNX communication |
EV = GDB181.1E/KN (KNX bus), 5 Nm |
Halton V1 |
Analogue controller Manufacturer: Belimo |
5 | 100-250 | DC0..10V/ 2..10V |
V1 = LM24A-VST, (DC 0/2…10 V), 5 Nm+VRU-D3-BAC |
Halton V2 |
Analogue controller Manufacturer: Belimo |
10 | 100-630 | DC0..10V/ 2..10V |
V2 = NM24A-VST, (DC 0/2…10 V), 10Nm+VRU-D3-BAC |
Halton V3 |
Analogue controller Manufacturer: Belimo |
4 | 100-250 | DC0..10V/ 2..10V |
V3 = LMQ24A-VST, 2.5 sec (DC 0/2…10 V), 4 Nm + VRU-D3-BAC |
Halton V4 |
Analogue controller Manufacturer: Belimo |
8 | 100-630 | DC0..10V/ 2..10V |
V4 = NMQ24A-VST, 4 sec (DC 0/2…10 V), 8 Nm + VRU-D3-BAC |
Halton EW |
Actuator with KNX Manufacturer: Siemens |
10 | 100-630 | KNX communication |
EW = GLB181.1E/KN (KNX bus), 10 Nm |
Halton EB |
Actuator with Modbus RTU (RS-485) Manufacturer: Siemens |
5 | 100-250 | Modbus communication | EB = GDB181.1E/MO (Modbus RTU), 5 Nm |
Halton EF |
Actuator with Modbus RTU (RS-485) Manufacturer: Siemens |
10 | 100-630 | Modbus communication | EF = GLB181.1E/MO (Modbus RTU), 10 Nm |
Halton HM |
Controller include actuator with LonWorks Manufacturer: Distech |
5 | 100-250 | LonWorks communication | HM = ECL-VAV-S, HAV (LonWorks), 5Nm |
Halton HK |
Modulating actuator from Belimo: Controller LonWorks Manufacturer: Distech |
10 | 100-630 | LonWorks communication | HK = ECL-VAV-N, HAV + NM24A-SR (LonWorks), 10 Nm |
NS | ⌀D | L | L1 | L2 | L3 | H | Weight (kg) |
125 | 124 | 329 | 257 | – | 184 | 134 | 2,3 |
160 | 159 | 329 | 257 | – | 219 | 169 | 2,6 |
200 | 199 | 494 | 422 | 15 | 259 | 209 | 3,3 |
250 | 249 | 494 | 422 | 38 | 309 | 259 | 3,9 |
NS | ⌀D | L | L1 | L2 | L4 | H1 | Weight (kg) |
125 | 124 | 329 | 257 | – | 305 | 225 | 2,7 |
160 | 159 | 329 | 257 | – | 340 | 260 | 3,6 |
200 | 199 | 494 | 422 | 15 | 380 | 300 | 4,4 |
250 | 249 | 494 | 422 | 38 | 430 | 350 | 5,3 |
The pressure-independent variable airflow management damper is made of galvanised steel, airflow measurement with orifice plate.
Duct connection shall include integral airtight rubber gaskets.
The management damper shall contain airflow measurement, flow controller and damper actuator.
It can operate either in duct static pressure control mode or duct airflow control mode.
The airflow management damper can be installed without safety distances.
The Halton Max MLC airflow control damper can be installed without safety distances. Accuracy of the measured airflow is given in a table below. Install the unit into ductwork in such a way that the airflow direction through the unit is as indicated with the arrow label in the unit casing.
Disturbances in the ductwork such as duct bends, T-branches and sound attenuators cause turbulence and an uneven airflow. This can lead to fluctuation and inaccuracy in measurement values.
The space between airflow damper and above mentioned disturbance can be set to 0D. Picture below demonstrates what 0xD means (see Fig. 2.). The accuracy varies according airflow and unit size (see chapter below: Accuracy of measurement with different airflows)
Fig.2. Safety distance examples
Fig.3. Installation cases
Nr. | Installation cases | Safety distance |
1. | T-branch, side duct | 0D |
2. | T-branch, main duct | 0D |
3. | Reducer, < D | 0D |
4. | Reducer, > D | 0D |
5. | Bend, elbow 90° | 0D |
Table 1. Safety distances of Halton Max MLC
Size | Airflow (l/s) | Airflow (m3/h) | Accuracy of measurement with 0D (%) |
125 | 7 | 24.8 | 15 |
28 | 100 | 10 | |
53 | 190 | 8 | |
74 | 266 | 5 | |
160 | 10 | 36 | 15 |
40 | 145 | 10 | |
81 | 290 | 8 | |
121 | 434 | 5 | |
200 | 16 | 56.5 | 15 |
63 | 226 | 10 | |
126 | 452 | 8 | |
188 | 678 | 5 | |
250 | 25 | 90 | 15 |
98 | 354 | 10 | |
197 | 710 | 8 | |
294 | 1060 | 5 |
In pressure control operation, the recommended safety distance between Halton Max MLC airflow damper and Halton MSS measuring unit is min. 5D (Fig.3.)
Fig.3. Halton Max MLC and Halton MSS, safety distance min. 5D
Airflow rate ranges of the Halton Max MLC are presented in the table below. The airflow rate range is valid both for pressure and airflow control applications.
NS | l/s min @ 0.5 m/s |
l/s max @ 6 m/s |
m3/h min @ 0.5 m/s |
m3/h max @ 6 m/s |
125 | 6,9 | 74.0 | 24.8 | 266.0 |
160 | 10.0 | 121.0 | 36.0 | 434.0 |
200 | 15.9 | 188.4 | 56.5 | 678.0 |
250 | 25.0 | 294.4 | 90.0 | 1060.0 |
The actual airflow rate can be calculated as a function of differential pressure at the Halton Max MLC measurement probe and the measurement probe k factor. The proper k factor can be found in an attachment for the product.
qv Actual airflow rate [l/s]
k k factor of the product
Δpm Differential pressure of measurement probe [Pa]
NS | k factor [l/s] | k factor [m3/h] |
125 | 7.5 | 27.0 |
160 | 11.3 | 40.6 |
200 | 21.7 | 78.0 |
250 | 27.7 | 99.7 |
The actual measured static pressure can be read from the LED display of the Halton MSS static pressure measurement unit with pressure transmitter. Pressure values can be read as network variables.
The transmitter designed to be installed in HVAC return air ducts. The size of the board and the dimensions of the case have been optimized to place the transmitter in small, i.e. 160 mm diameter, return air ducts. This product offers a sleek design, a simple analog output, and it is easy to install. The transmitter includes mounting hardware and installation instructions.
More information: Link to manufacture’s datasheet
The Halton HDP-PE differential pressure sensor is a pressure-measuring device, used to measure differential pressures in the duct. It gives an accurate measurement of the airflow. The influence of process disturbances can be filtered by increasing the time constant.
More information: Link to manufacture’s datasheet
Transmitter 35 VA for DIN rail installation.
More information: Link to manufacture’s datasheet
S = Model
G Damper with blade gasket
I Damper with blade gasket, insulation 50 mm
D = Connection size (mm)
125, 160, 200, 250
MA = Material
GS Galvanised steel
CU = Control unit
EM LMV-D3-MF-F.1 HI (DC 0/2…10 V), 5 Nm
EK NMV-D3-MF-F.1 HI (DC 0/2…10 V), 10 Nm
EC LMV-D3-MP (MP bus), 5 Nm
EE NMV-D3-MP (MP bus), 10 Nm
ER LMV-D3-KNX (KNX bus), 5 Nm
ES NMV-D3-KNX (KNX bus), 10 Nm
ET LMV-D3-MOD (Modbus RTU), 5 Nm
EU NMV-D3-MOD (Modbus RTU), 10 Nm
EH GDB181.1E/3 (DC 0/2…10 V), 5 Nm
EG GLB181.1E/3 (DC 0/2…10V), 10 Nm
EV GDB181.1E/KN (KNX bus), 5 Nm
EW GLB181.1E/KN (KNX bus), 10 Nm
EB GDB181.1E/MO (Modbus RTU), 5 Nm
EF GLB181.1E/MO (Modbus RTU), 10 Nm
V1 LM24A-VST, (DC 0/2…10 V), 5 Nm+VRU-D3-BAC
V2 NM24A-VST, (DC 0/2…10 V), 10Nm+VRU-D3-BAC
V3 LMQ24A-VST, 2.5 sec (DC 0/2…10 V), 4 Nm+VRU-D3-BAC
V4 NMQ24A-VST, 4 sec (DC 0/2…10 V), 8 Nm+VRU-D3-BAC
HM ECL-VAV-S, HAV (LonWorks), 5Nm
HK ECL-VAV-N, HAV + NM24A-SR (LonWorks), 10 Nm
SE = Sensors
NA Not assigned
DS1 Duct sensor (CO2G, Duct CO2)
P1 Differential pressure transmitter (HDP-PE)
TF = Transformer
NA Not assigned
TF1 230/24 transformer (35VA)
ZT = Tailored product
N No
Y Yes
MLC/G-160, MA=GS, CU=ER, SE=P1, TF=NA, ZT=N