Plenum for Halton SLL and SLN diffusers
|1||235||117||47||160 or 125|
|2||275||155||85||200, 160 or 125|
|3||275||193||123||200, 160 or 125|
|4||325||231||161||250, 200, 160 or 125|
In addition to standard linear slot diffuser sizes, other sizes can be ordered.
The maximum active length of one piece is 2000 mm. The minimun is 372 mm.
Continuous plenums with modular design are also available for installation lengths greater than 2000 mm.
|Plenum box/spigot||Galvanised steel||–|
|Mineral wool or
|The mineral wool
is fixed with nails
|Sound attenuation material||2W||Mineral wool on 2 sides|
|Sound attenuation material||5W||Mineral wool on 5 sides|
|Sound attenuation material||2P||Polyester fibre on 2 sides|
|Sound attenuation material||5P||Polyester fibre 5 sides|
|Airflow measurement and
|OM||For supply installation|
The duct pressure and air velocity are reduced inside the Halton PLL plenum box.
Air is supplied into the space through the diffuser, improving the air distribution quality.
The airflow rate can be adjusted using the optional measurement and adjustment module MSM.
2. Measurement and adjustment module
The Halton PLL is installed into the suspended ceiling with M8 drop rods (not supplied in the delivery) and connected to the ductwork with a spigot equipped with an integral rubber gasket.
When equipped with a measurement and adjustment module, the recommended safety distance upstream of the device is at least 3D, in order to ensure a reliable airflow rate measurement.
The unit s control spindle must not be excessively bent.
In order to enable airflow adjustment and measurement of airflow rate, it is recommended that the diffuser be connected to the plenum equipped with the MSM module.
The supply flow rate is determined by using the measurement and adjustment module MSM.
Detach the diffuser and pass the tubes and control spindle through the diffuser.
Replace the diffuser.
Measure the differential pressure using a manometer. The flow rate is calculated using the formula below:
∆pm Measured pressure [Pa]
k The k factor given as a function of mounting and diameter
qv Airflow rate [l/s]
The k-factor for installations with different safety distances
(D= duct diameter):
|PLL||> 6xD||min. 3xD|
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 into the plenum and replace the diffuser.
Remove the measurement and adjustment module by gently pulling the shaft (not the control spindle).
Wipe the parts with a damp cloth, instead of immersing in water.
Reassemble the measurement and adjustment module by pushing the shaft back into place until the module meets the stopper.
The plenum is made of galvanised steel.
The plenum comprises an airflow measurement and adjustment module.
The diffuser is detachable in order to provide access to the measurement and adjustment module in the plenum.
The plenum comprises sound attenuation material made of mineral wool or polyester fibre.
The plenum reduces duct pressure and air velocity in order to supply air throughout the entire face area of the linear diffuser and improve the air distribution quality.
S = Number of slots
1, 2, 3, 4
L = Active length (mm)
372, +1, .., 49972
D = Duct connection size (mm)
125, 160, 200, 250
N = Number of duct connections
1, +1, …, 322
IN = Sound attenuation
2W 2 sides, mineral wool
5W 5 sides, mineral wool
2P 2 sides, polyester fibre
5P 5 sides, polyester fibre
ST = Spigot type
G With gasket (standard)
W Without gasket
OM = Measurement/adjustment module (MSM)
ID = Diffuser assembled with plenum
ZT = Tailored product
Y Yes (ETO)
PLL/1-400-160-1, IN=N, ST=G, OM=N, ZT=N