
UTT - Airflow damper

Tight multi-blade damper
Rectangular tight shut-off and balancing damper available with various modular construction and sizes. The shut-off class 3 according to EN 1751.
- Shut-off and balancing damper for outdoor air intake and exhaust air with opposed blade design
- Damper blades comprise thermal insulation
- Tightness in closed position fulfills EN 1751 class 3 requirements
- Temperature operation range up to +100°C, optionally up to +200°C
- Galvanised steel design
- Classification of casing leakage EN 1751 class B
Product models and Accessories
- Model with stainless steel /acid-proof steel (AISI 316) design.
- Model with insulated casing
- Model with heat-proof design
- Circular duct connections
- Several actuator options
The casing and blades are made from galvanised steel or stainless steel AISI 316).
The blade gaskets are made of silicon (or EPDM- rubber).
The drive shaft socket is made of galvanised steel with self-lubricating slide bearings.
The bearing is made from an alloy of polyamide and molybdenum sulphide (or stainless steel AISI 316 or stainless steel AISI 304 or bronze).
The damper is installed into rectangular ducts in compliance with EN 1751, or in circular ducts D=100 ...1250mm in accordance with EN 1751.
The damper meets the tightness requirements of EN 1751 class 3.
The casing of the damper meets the tightness requirements of EN 1751 class B.
Heat transmission of the damper does not exceed 6 W/(m2K).
The damper is suitable for either manual adjustment or actuator operation.
Halton UTT
Tight multi-blade damper
- Shut-off and balancing damper for outdoor air intake and exhaust air with opposed blade design
- Damper blades comprise thermal insulation
- Tightness in closed position fulfills EN 1751 class 3 requirements
- Temperature operation range up to +100°C, optionally up to +200°C
- Galvanised steel design
- Classification of casing leakage EN 1751 class B
Product models and Accessories
- Model with stainless steel /acid-proof steel (AISI 316) design.
- Model with insulated casing
- Model with heat-proof design
- Circular duct connections
- Several actuator options
Dimensions ▲
Models with rectangular connections
W | H |
100, 200, ..., 2400 | 100, 200, ..., 2400 |
Models with circular connections (CT=D1 or CT=D2)
ØD | WxH |
100 | 150x150 |
125 | 150x150 |
160 | 200x200 |
200 | 200x200 |
250 | 250x250 |
315 | 300x300 |
400 | 400x400 |
500 | 500x500 |
630 | 600x600 |
710 | 800x800 |
800 | 800x800 |
1000 | 1000x1000 |
1250 | 1250X1250 |
Material ▲
Part | Material | Note |
Casing | Galvanised steel | Stainless steel (AISI 316) also available |
Blades (sandwich design) | Galvanised steel | Stainless steel (AISI 316) also available |
Damper blade insulation | Polyurethane | CFC free |
Damper blade gaskets | Silicon | Heat-proof model: LTE silicon |
Gasket inside the casing | Silicon | Fixed in an aluminium profile |
Duct gaskets | Rubber compound | Circular connections |
Slide bearings | Alloy of polyamide and molybdenum suphide | Self-lubricated Heat-proof model, Stainless steel (AISI 304), Stainless steel (AISI 316) |
Rectangular drive shaft | Galvanised steel | In conjunction with standard bearings |
Round drive shaft Ø15 mm | Stainless steel (AISI 316) | In conjunction with AISI or bronze bearings |
Shaft types and dimensions
Depending on the choice of bearing material, the damper will be equipped with a round or square axle.
On Halton UTT/R dampers with standard bearings (BE=ST) , the damper will be equipped with a square 15x15 mm galvanised steel axle.
On heatproof design Halton UTT/R dampers, and on all dampers with AISI316/304 or bronze JN5 bearings (BM=AS, BM=SS or BM=BR) a round Ø15mm AISI 316 stainless steel axle will be used.
Accessories ▲
The product models MD=I and MD=J have a double sheet casing with mineral wool insulation. The insulation thickness is 20 mm.
The Halton UTT damper is available equipped with either manual adjustment or actuator operation.
The adjustment and control arrangement options are:
Adjustment and control options | Code | Note |
Manual handle adjustment | MO = MA | |
Manual extension bar adjustment | AC = BA | Handle extension arrangement |
Actuator operation | MO= | See tables below |
The damper actuator is selected from the list below according to the
operating voltage, control arrangement and the required torque of the damper.
The torque of the selected actuator can be higher than the required torque of the damper.
Actuator options
LM-models Torque, damper size ...4 Nm A<0.4 m 2
Manual override operation, mechanical position limit
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
LM24A | B6 | On-off, 1- or 2-wire control | AC/DC 24 V | 2 VA |
LM24A-S | B7 | On-off, 1- or 2- wire control, auxiliary switch | AC/DC 24 V | 2 VA |
LM230A | B8 | On-off, 1- wire control | AC 230 V | 4 VA |
LM230A-S | B9 | On-off, 1- wire control, auxiliary switch | AC 230 V | 4 VA |
LM24A-SR | B0 | Control signal DC 0…10 V | AC/DC 24 V | 2 VA |
LF-models Torque, damper size ... 4 Nm A<0.4 m2
Spring return, mechanical position limit
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
LF24 | B1 | On-off | AC/DC 24 V | 7 VA |
LF24-S | B2 | On-off, auxiliary switch | AC/DC 24 V | 7 VA |
LF230 | B3 | On-off | AC 230 V | 7 VA |
LF230-S | B4 | On-off, auxiliary switch | AC 230 V | 7 VA |
LF24-SR | B5 | Control signal DC 0...10 V | AC/DC 24 V | 5 VA |
NM-models Torque, damper size ... 8 Nm A<1.2 m 2
Manual override operation,mechanical position limit
Actuator type | Code MO | Control arragement | Operating voltage | Power consumption |
NM24A | C1 | On-off, 1- or 2-wire control | AC/DC 24 V | 4 VA |
NM230A | C2 | On-off, 2- wire control | AC 230 V | 6 VA |
NM24A-SR | C3 | Control signal DC 0…10 V | AC 24 V | 4 VA |
NM230 | C4 | On-off, 1- wire control | AC 230 V | 18 VA |
BLF-models Torque, damper size ... 4 Nm A<0.4 m2
Spring return, manual operation, position lock
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
BLF24-HL | L1 | On-off, 2 auxiliary switches | AC/DC 24 V | 7 VA |
BLF230-HL | L5 | On-off, 2 auxiliary switches | AC 230 V | 7 VA |
BF-models Torque, damper size ...12 Nm A<2.5 m 2
Spring return, manual operation, position lock
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
BF24-2.1HL | E1 | On-off, 2 auxiliary switches | AC/DC 24 V | 10 VA |
BF230-2.1HL | E3 | On-off, 2 auxiliary switches | AC 230 V | 12.5 VA |
BF120 | E7 | On-off, 2 auxiliary switches | AC 120 V | 12.5 VA |
SF-models Torque, damper size ... 20 Nm A<4 m2
Spring return, manual operation, position lock
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
SF24A | A6 | AC/DC 24 V | 10 VA | |
SF24A-S2 | A7 | 2 auxiliary switches | AC/DC 24 V | 10 VA |
SF230A | A8 | AC 230 V | 11 VA | |
SF230A-S2 | A9 | 2 auxiliary switches | AC 230 V | 11 VA |
SF24A-SR | A0 | Control signal DC 0…10 V or 0...20 V phase-cut | AC 24 V | 10 VA |
SM-models Torque, damper size ... 18 Nm A<3.3 m2
Manual override operation, mechanical position limit
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
SM24A | A1 | On-off, 1- or 2-wire control | AC/DC 24 V | 4.5 VA |
SM24A-S | A2 | On-off, 2-wire control, 2 auxiliary switches | AC/DC 24 V | 4.5 VA |
SM230A | A3 | On-off, 1- or 2-wire control | AC 230 V | 25 VA |
SM230A-S | A4 | On-off, 1-wire control, 2 auxiliary switches | AC 230 V | 25 VA |
SM24A-SR | A5 | Control signal DC 0...10 V | 24 VAC | 5 VA |
GM-models Torque, damper size ...30 Nm A<6m2
Manual override operation
Actuator type | Code MO | Control arrangement | Operating voltage | Power consumption |
GM24A | G1 | On-off, 1- or 2-wire control | AC/DC 24 V | 7 VA |
GM230A | G2 | On-off, 2-wire control | AC 230 V | 7 VA |
Required torque for Halton UTT-damper actuator
Function ▲
The Halton UTT dampers are used to shut off or control airflow in ductwork where tightness, thermal insulation and reliability are important.
In the closed position the Halton UTT damper leakage class is 3 in accordance with the EN1751 standard.
In the open position the blades are turned in the direction of flow and do not cause significant pressure losses.
Damper sizes conform with the international standards EN 1505, EN1506 and ISO 1707 for rectangular and circular ducts.
The maximum operation temperature of a standard damper is +100°C (for optional models +200°C).
Heat transmission of the damper is 6 W/(m 2 K).
Installation ▲
Code description
1. Casing
2 . Blade
3. Gaskets
4. Manual adjustment handle / actuator platform
Install the damper in the ductwork with the blades in horisontal or vertical position.
Fasten the damper in the ductwork using slip joints.
Optional models enable fastening the damper to duct flange by using bolts.
Drill holes in the damper flange if necessary (options L1 & L2).
Use a seal between the flanges in order to tighten the seam.
Fasten the models with circular connections by riveting or screwing.
Specification ▲
The casing and blades are made from galvanised steel or stainless steel AISI 316).
The blade gaskets are made of silicon (or EPDM- rubber).
The drive shaft socket is made of galvanised steel with self-lubricating slide bearings.
The bearing is made from an alloy of polyamide and molybdenum sulphide (or stainless steel AISI 316 or stainless steel AISI 304 or bronze).
The damper is installed into rectangular ducts in compliance with EN 1751, or in circular ducts D=100 ...1250mm in accordance with EN 1751.
The damper meets the tightness requirements of EN 1751 class 3.
The casing of the damper meets the tightness requirements of EN 1751 class B.
Heat transmission of the damper does not exceed 6 W/(m2K).
The damper is suitable for either manual adjustment or actuator operation.
Order Code ▲
UTT/S-W-H-D, CT-SF-MA-MD-BM-MO-AC-ZT
S = Type of duct connections
R Rectangular connections
C Circular connections
W = Width
100,+1,..,2400
H = Height
100,+1,..,2400
D = Connection size (for circlular model, C)
100, 125, 160, 200, 250, 315, 400, 500, 630, 710, 800, 1000, 1250
Other options and Accessories
CT = Type of circular connection
D2 2 circular connections
D1 1 circular connection
SF = Flange option
NA No special frame construction
L1 Standard + flange connection
L2 Flange connection on both sides
R2 Flange connection with holes
MA = Material
CS Steel
AS Stainless steel (AISI 316)
MD = Model
N Standard
H Heat-proof
I Insulated
J Heat-proof and insulated
BM = Bearing material
ST Standard (Plastic)
AS Stainless steel (AISI 316)
SS Stainless steel (AISI 304)
BR Bronze JN5
MO = Actuator type
NA Not assigned
MA Manual handle
E1 Electric BF24-2.1HL
E3 Electric BF230-2.1HL
E7 Electric BF120-HL
P0 Pneumatic,Rot.AT100
A1 Electric SM24A
A2 Electric SM24A-S
A3 Electric SM230A
A4 Electric SM230A-S
A5 Electric SM24A-SR
A6 Electric SF24A (replace old AF24)
A7 Electric SF24A-S2 (replace old AF24-S)
A8 Electric SF230A (replace old AF230)
A9 Electric SF230A-S2 (replace old AF230-S)
A0 Electric SF24A-SR (replace old AF24-SR)
C1 Electric NM24A
C2 Electric NM230A
C3 Electric NM24A-SR
AC = Accessories
BA Bar adjustment
S1 SN1 Auxiliary switch
S2 SN1/500 auxiliary switch
S3 SN2 Auxiliary switch
S4 S2A Auxiliary switch
L1 Limit switch, 1 pc, IP65
L2 Limit switches, 2 pcs, IP65
L3 EX-proof limit switch, 1 pc, IP66
L4 EX-proof limit switches, 2 pcs, IP66
M1 Solenoid valve 24 VAC
M2 Solenoid valve 230 VAC
M3 EX-proof solenoid valve 24V
M4 EX-proof solenoid valve 230V
ZT = Tailored product
N No
Y Yes
Code example
UTT/R-100-100, SF=NA, MA=CS, MD=N, BM=ST, MO=MA, ZT=N
Downloads & Media
Halton UTK ja UTT - fi | Type Datasheet | Language Finnish (Finland) | Size 756.5 kB |
Halton UTK of UTT - nl | Type Datasheet | Language Dutch (Netherlands) | Size 757.5 kB |
Halton UTK_UTT - ru | Type Datasheet | Language Russian (Russia) | Size 788.0 kB |
Halton UTK och UTT - se | Type Datasheet | Language Swedish (Sweden) | Size 755.8 kB |
Halton UTK and UTT - uk | Type Datasheet | Language English (United Kingdom) | Size 753.9 kB |
Halton UTT - fr | Type Datasheet | Language French (France) | Size 1.0 MB |
UTT-ATEX-CERTIFICATE | Type Certificate | Language English (United Kingdom) | Size 1.8 MB |