PLD - Plenums

Plenum for linear slot diffuser

Plenum for SLL and SLN.

  • Plenum for connecting 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 & ACCESSORIES

  • Detachable airflow rate measurement and balancing module available.

The plenum shall be made of galvanised steel.

The plenum shall comprise an airflow measurement and adjustment module.

The diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum.

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.

Introduction

Halton PLD

Plenum for SLL and SLN linear slot diffusers
 


 

  • Plenum for connecting 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 & Accessories

  • Detachable airflow rate measurement and balancing module available.

Dimensions

Dimensions


Halton PLD

 

Slots H K ØD
1 235 47 160
2 275 85 200
3 275 123 200
4 325 161 250

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 length is 2000 mm.
Continuous plenums with modular design are also available for installation lengths greater than 2000 mm.
 

Material

Material


Halton PLD

 Part  Material  Note
 Plenum box / spigot  Galvanised steel  Spigot equipped with rubber gasket



 

Accessories

Accessories


Halton PLD

 

 Accessory Code  Description
 Airflow measurement and
 adjustment unit (MSM)
OM  For supply installation (3 and 4 slot diffusers)


Function

Function


Halton PLD



The duct pressure and air velocity are reduced inside the Halton PLD plenum box.
Air is supplied into the space through the diffuser, improving the air distribution quality.
When the Halton PLD is supplied equipped with a measurement and adjustment unit, the volume flow rate can be balanced.


 

Installation

Installation


Halton PLD



The plenum is installed into the suspended ceiling with M8 drop rods (not supplied in the delivery).
Connect the plenum to the ductwork with a spigot equipped with an integrated 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

Adjustment


Halton PLD

In order to enable airflow adjustment and measurement of airflow rate, it is recommended that you connect the diffuser to the plenum equipped with the MSM module.
The supply flow rate is determined by using the measurement and adjustment module MSM.

Detach the linear slot diffuser and pass the tubes and control spindle through the diffuser.
Replace the diffuser / exhaust unit.
Measure the differential pressure using a manometer. The flow rate is calculated using the formula below.



 

where:

∆Pm      Measured pressure [Pa]
k            A factor given as a function of mounting and diameter
Qv         Airflow rate [l/s]

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.

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

NS > 6xD min 3xD
160 19 22
200 28 32
250 49 51

Servicing

Servicing


Halton PLD

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.
 

Technical specification

Technical specification text

 

The plenum shall be made of galvanised steel.

The plenum shall comprise an airflow measurement and adjustment module.

The diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum.

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.

 

Product Code

Product code


PLD/S-L-D-N

S = Number of slots
 
    1, 2, 3, 4

L = Length
      372,+1,..,50000

D = Diameter of duct connection
      160, if S = 1
      200, if S = 2 or 3
      250, if S = 4

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


Other options and accessories
 

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

Code example

         PLD/1-400-160-1, IN=N, OM=N

 

Downloads & Media

Halton PLD-PLL - nl
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Nederlands (Nederland)
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Halton PLL-PLD - fr
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Frans (Frankrijk)
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Halton PLD-PLL - fi
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Halton PLD-PLL - ru
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Halton PLD-PLL - se
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Halton PLD-PLL - gb
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Engels (Verenigd Koninkrijk)
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459,5 kB