PLL - 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

  • Model with sound attenuation material
  • 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 shall comprise sound attenuation material made of mineral wool.

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

PLL

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

  • Model with sound attenuation material
  • Detachable airflow rate measurement and balancing module available.

Dimensions


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

Material

 

MATERIAL AND FINISHING

PART MATERIAL NOTE
Plenum box / spigot Galvanised steel  Spigot equipped with rubber gasket
Sound attenuation material Mineral wool The mineral wool is fixed with nails


Accessories

 

ACCESSORIES

ACCESSORY CODE DESCRIPTION
Sound attenuation material IN Mineral wool in the PLL
plenum on 2 sides (IN=2)
Sound attenuation material IN Mineral wool in the PLL
plenum on 5 sides (IN=5)
Airflow measurement and
adjustment unit
OM For supply installation


Function

 

FUNCTION



The duct pressure and air velocity are reduced inside the 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

 

INSTALLATION



CODE  DESCRIPTION
1  PLENUM
2  MEASUREMENT AND ADJUSTMENT MODULE

The 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

 

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.


 

where:

∆Pm is the measured pressure (Pa)
is a factor given as a function of mounting and diameter
Qv is the 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)
 

PLL >6XD min 3XD
160 19 22
200 49 32
250 51 51


Servicing

 

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

SUGGESTED SPECIFICATIONS

  • 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 shall comprise sound attenuation material made of mineral wool.
  • 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

PLL/S-L-D-N


   S = Number of slots    1, 2, 3, 4

   L = Length
    372, +1, .., 50000

   D = Diameter of duct connection
    S=1: 160 (or 125)
    S=2 or S=3: 200 (or 160 or 125)
    S=4: 250 (or 200 or 160 or 125)

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


Specifics and accessories

   IN = Sound attenuation material    

    N  No attenuation material
    2  Sound attenuation material on 2 sides
    5  Sound attenuation material on 5 sides

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

 

Code example

   PLL/1-400-160-1, IN=N, OM=N
 

Downloads & Media

Halton PLD-PLL - nl
Type
Datasheet
Taal
Nederlands (Nederland)
Grote
459,9 kB
Halton PLL-PLD - fr
Type
Datasheet
Taal
Frans (Frankrijk)
Grote
1,1 MB
Halton PLD-PLL - fi
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Datasheet
Taal
Fins (Finland)
Grote
459,7 kB
Halton PLD-PLL - ru
Type
Datasheet
Taal
Russisch (Rusland)
Grote
478,8 kB
Halton PLD-PLL - se
Type
Datasheet
Taal
Zweeds (Zweden)
Grote
460,9 kB
Halton PLD-PLL - gb
Type
Datasheet
Taal
Engels (Verenigd Koninkrijk)
Grote
459,5 kB