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Halton TLD – Nozzle diffuser unit

Modern in design and adjustable thrown pattern, multi-nozzle diffuser for wall installation

  • Directional nozzles with two-slot air path which deflect the air streams effectively
  • Installation of the diffuser on the wall in the vicinity of the ceiling
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  • Horizontal plane jet air supply
  • Directional nozzles with two-slot air path which deflect the air streams effectively
  • Installation of the diffuser on the wall in the vicinity of the ceiling
  • Airflow rate measurement and adjustment functions
  • Circular duct connection with gasket on the back or on the side of the plenum
  • Cleaning of the terminal unit and supply ductwork enabled by the detachable diffuser section

Product models and accessories

  • Plenums with duct connection on the back or side
  • Cover sleeve for exposed installations

Quick selection

Fig.1. Halton TLD with back connection, supply (with MSM-module)

Dimensions and weight

Halton TLD/B (back connection)

100 441 403 191 153 204 99
125 441 403 241 203 204 124
160 541 503 241 203 241 159
200 741 703 291 253 280 199
250 793 751 341 304 299 249

Halton TLD/E  (side connection)

NS W W1 H H1 K K1 ØD
100 441 403 191 153 301 211 99
125 441 403 241 203 301 198 124
160 541 503 241 203 408 286 159
200 741 703 291 253 408 265 199

NOTE! Size 250 is not available for side connection.

Weight (kg)

(back connection)
(side connection)
(diffuser section)
100   1.9 2,8 1,7
125   2.2 3,2 2,1
160   2.9 4,5 2,1
200   4.5 6,2 4,6
250   5,1 5,1


Part Material Note
Diffuser section Steel
Nozzle Polyacetal POM Colour options:
White, Grey and Black
Plenum Galvanised steel
Attenuation material Polyester fibre Cutting edges protected
Cover sleeve Galvanised steel Painted in diffuser colour
Coupling sleeve
with gasket
Galvanised steel Gasket of rubber compound
Finishing Painted,
White (RAL 9003)
Only front panel (TLD/A),
special colours available


 Accessory Code Description
 Cover sleeve CE Cover sleeve for exposed installation
(available only for back connection)

Cover sleeve (CE)

Product models

Model Description
TLD/A Supply air unit, front plate (needing a plenum from below)
TLD/B Plenum with back connection, supply (with MSM-module)
TLD/E Plenum with side connection, supply (with MSM-module)

Fig.1. TLD/A

Fig.2. TLD/B                                        Fig.3. TLD/E


The nozzles of the diffuser direct the airflow obliquely toward the ceiling surface.
The supply air pattern can be directed by rotating the nozzles.
Direction of the supply air jet does not affect the pressure drop or the airflow rate.
The recommended maximum air temperature difference between supply and room air is 8 °C.
The maximum recommended operating temperature for the plastic material is 60 °C.

The airflow pattern data has been prepared for a wall installation with a distance of 200 mm from the ceiling surface (I) for a direct discharge without ceiling (II).


Code description
1.   Diffuser section
2.   Measurement and adjustment module (MSM/supply)
3.   Plenum

The recommended installation distance below ceiling level is approx. 200 mm.

Installation opening

          NS W2 x H2
          100 405 x 155
          125 405 x 205
          160 505 x 205
          200 705 x 255
          250 * 755 x 255

*) Only back connection available(TLD/B)

           NS K1
           80 75
          100 85
          125 85
          160 100
          200 125
          250 * 125

*) Only back connection available  (TLD/B)

Do not fasten screws or rivets in the section at distance K1 from the front edge of the plenum, in order to keep the section clear for diffuser section (1) fastening.

Safety distance

The recommended minimum safety distance before the supply unit is 3xD.


The supply flow rate is determined by using measurement and adjustment module MSM. The tubes and control spindle are passed through the nozzles of the diffuser section, which is then replaced. Measure the differential pressure with a manometer.

The flow rate is calculated using the formula below (k-value in the bottom of page).

Adjust the airflow rate by rotating the control spindle until the desired setting is achieved. Lock the damper position with a screw. Replace the tubes and spindle in the diffuser section.

The k factor for installations with different safety distances
(D= duct diameter)

Supply air

                   NS > 8xD min. 3xD
                  100 5.8 6.4
                  125 9.4 12.6
                  160 16.1 22.0
                  200 26.9 32.7
                  250 * 45.8 55.5

*) Only back connection (TLD/B)

The supply air pattern can be freely adjusted by rotating the nozzles manually.

Adjusting the nozzles



Open the Halton TLD diffuser section, and remove the measurement and adjustment module by gently pulling from the shaft (not from the control spindle or measurement tubes).

Wipe the parts with a damp cloth, instead of immersing in water.

Reassemble the measurement and adjustment module by pushing the shaft until it meets the stopper.
The diffuser section is replaced by pushing it into the plenum until the springs lock.


The diffuser consists of a galvanised steel plenum and a detachable diffuser section made of epoxy-painted steel, with white (RAL 9003) as standard colour.

The detachable diffuser section includes adjustable nozzles and be attached to the plenum with invisible springs.
The wall diffuser unit has the supply air pattern obliquely toward the ceiling or directly forward. The ductwork connectionis be located at the back or side of the unit.

The throw pattern size and shape is adjustable individually by rotating the nozzles.
The diffuser provides access to the plenum and ductwork for cleaning and maintenance.

Order code


S = Construction
A    Diffuser section
B    Plenum with duct connection on back (supply with MSM module)
E    Plenum with duct connection on side (supply with MSM module)

D = Duct connection size (mm)
100, 125, 160, 200, 250

Other options and accessories

CO = Colour
SW    Signal white (RAL 9003)
X        Special colour (RAL xxxx)

ZT = Tailored product
N      No
Y      Yes (ETO)

Sub products

CE   Cover sleeve  (for back connection only, TLD/B)

Code example

TLD/A-100, CO=SW, ZT=N           (Diffuser section)
TLD/B, ZT=N                                    (Plenum, supply, back connection, MSM)


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