PLL - Plenum box

Plenum for linear slot diffuser

Plenum for Halton SLL and SLN diffusers

  • Plenum for connecting Halton SLL and SLN linear slot diffuser supply/exhaust unit to ductwork
  • Ensures proper function of the supply air diffuser
  • Access for ductwork cleaning

Product Models and Accessories

  • Model with sound attenuation, mineral wool or polyester fibre
  • Detachable airflow rate measurement and balancing module available.

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.

Halton PLL

Plenum for Halton SLL and SLN linear slot diffusers

  • Plenum for connecting Halton SLL and SLN linear slot diffuser supply/exhaust unit to ductwork
  • Ensures proper function of the supply air diffuser
  • Access for ductwork cleaning

Product Models and Accessories

  • Model with sound attenuation material. mineral wool or polyester fibre
  • Detachable airflow rate measurement and balancing module available.

Dimensions

Slots H K K1  ØD
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

 

Standard dimensions for linear slot diffusers

 Diffuser active
 length (mm)
572 872 1172 1472 1772
 L (mm) 571 871 1171 1471 1771
 L1 (mm) 286 436 586 368 443
 Duct connections
 (pcs)
1 1 1 2 2

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.

Material

 Part  Material  Note
 Plenum box / spigot  Galvanised steel  Spigot equipped with
 rubber  gasket
 Sound attenuation
 material
 Mineral wool or
 polyester fibre
 The mineral wool
 is fixed with nails

Accessories

 Accessory Code  Descritption
 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
 adjustment unit
OM  For supply installation

Function

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.

Installation

Key:
1.  Plenum
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.

Adjustment

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
160 19 22
200 49 32
250 51 51

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. 

Servicing

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.

Specification

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.

Order Code

PLL/S-L-D-N; IN-OM-ZT

S = Number of slots
      1, 2, 3, 4

L = Length
      372, +1, .., 50000

D = Diameter of duct connection
       125, 160, 200, 250

N = Number of duct connections
       1, +1, .., ((L-30)/(D+30)1)
 

Other Options and Accessories

 IN = Sound attenuation material    
        N        No attenuation material
        2W     Sound attenuation material on 2 sides, mineral wool
        5W     Sound attenuation material on 5 sides, mineral wool
        2P      Sound attenuation material on 2 sides, polyester fibre
        5P      Sound attenuation material on 5 sides, polyester fibre

OM = Measurement/adjustment module MSM
         N     No measurement or adjustment module
         Y     MSM installed in each duct connection

ZT = Tailored product
         N      No
         Y      Yes
 

Code example

        PLL/1-400-160-1, IN=N, OM=N, ZT=N

Downloads & Media

Halton PLD-PLL - nl
Type
Datasheet
Language
neerlandés (Países Bajos)
Size
459.9 kB
Halton PLL-PLD - fr
Type
Datasheet
Language
francés (Francia)
Size
1.1 MB
Halton PLD-PLL - fi
Type
Datasheet
Language
finés (Finlandia)
Size
459.7 kB
Halton PLD-PLL - ru
Type
Datasheet
Language
ruso (Rusia)
Size
478.8 kB
Halton PLD-PLL - se
Type
Datasheet
Language
sueco (Suecia)
Size
460.9 kB
Halton PLD-PLL - gb
Type
Datasheet
Language
inglés (Reino Unido)
Size
459.5 kB