PDF - Plenum box

Plenum for diffusers

Plenum for Halton DFB and DFC diffusers

  • Plenum for connecting Halton DFB or DFC 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
  • 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 plenum comprises 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 Halton DFB or DFC diffuser and improve the air distribution quality and the noise level.

Halton PDF

Plenum for Halton DFB and DFC diffusers 

  • Plenum for connecting Halton DFB or DFC 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
  • Detachable airflow rate measurement and balancing module available.

Dimensions

Halton PDF/H

Size

L1 L2 D
6x6 150 150 125
9x6 225 150 160
9x9 225 225 200
12x6 300 150 160
12x9 300 225 200
12x12 300 300 250
15x6 375 150 200
15x9 375 225 250
15x12 375 300 315
15x15 375 375 315
18x6 450 150 200
18x9 450 225 315
18x12 450 300 315
18x15 450 375 355
18x18 450 450 315, 400
21x9 525 225 315
21x12 525 300 315
21x15 525 375 355
21x18 525 450 400
21x21 525 525 450
24x9 600 225 315
24x12 600 300 355
24x15 600 375 400
24x18 600 450 450
24x21 600 525 450
24x24 600 600 500

 Plenum sizes for Halton DFB diffusers are shown in grey rows in table above.
 

 

Halton PDF/V

Size L1 L2 D
6x6 150 150 125
12x12 300 300 250
15x15 375 375 315
18x18 450 450 315, 400
21x21 525 525 450
24x24 600 600 500

Material

 Part  Material  Note
 Plenum box / spigot  Galvanised steel  
 Sound attenuation material  Mineral wool  The mineral wool is fixed
 with nails

Accessories

 Accessory Code  Description
 Sound attenuation material IN  Mineral wool in the Halton PDF/H
 on 5 sides (IN=Y)
 Sound attenuation material IN  Mineral wool in the Halton PDF/V
 on 4 sides (IN=Y)
 Airflow measurement and
 adjustment unit
OM  For supply application
 Airflow adjustment unit REG  For supply application

Function

The duct pressure and air velocity are reduced inside the Halton PDA plenum.
Air is supplied into the space through the diffuser, improving the air distribution quality and the noise level.

The airflow rate can be adjusted using the optional measurement and adjustment module MSM or adjust manually with a REG

Installation

Key:
1.   Plenum
2.   Spigot
3.   Clips
4.   DFB or DFC plenum

Plenum installation
The plenum is installed into the suspended ceiling with M8 drop rods (not supplied in the delivery) and connected to the ductwork with a spigot.
When equipped with a measurement and adjustment module, the recommended safety distance upstream of the device is at least 3xD, in order to ensure a reliable airflow rate measurement.
The units control spindle must not be excessively bent.

Diffuser installation
The diffuser is attached to the plenum via clips.

Adjustment

To aid in adjusting and measuring the airflow rate, it is recommended that the diffuser is connected to a plenum equipped with a MSM.
The supply airflow is determined by measuring the pressure difference with a measurement module.

Measure the differential pressure with a manometer. The airflow rate is calculated according to the following formula:

pm      Measured pressure [Pa]
k            k factor given as a function of mounting and diameter
qv          Airflow rate

The k factor for installations with different safety distances
(distance of other items from the MSM):

  Safety distance
Spigot Diameter > 6xD min 3xD
100 6 7
125 10 12
160 19 22
200 28 32
250 49 51
315 78 -

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

Replace the tubes and spindle in the plenum, and return the diffuser to its position.

Servicing

Supply and exhaust

Detach the diffuser, clean the parts by wiping with a damp cloth.
Push the diffuser back into place by clipping the plenum.
 

Option: MSM

Remove the measurement and adjustment module by gently pulling the shaft; (not 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 back into place until the module meets the stopper.
Push the diffuser back into place.

Specification

The plenum is made of galvanised steel.

The plenum comprises an airflow measurement and adjustment module.

The plenum comprises 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 Halton DFB or DFC diffuser and improve the air distribution quality and the noise level.

Order Code

PDF/S-L-H-D, IN-OM-ZT

S = Model
       V     Vertical
       H     Horizontal

L = Length   
       6, 9, 12, 15, 18, 21 or 24
     

 H = Height 
       6,  9, 12, 15, 18, 21 or 24   

D = Diameter of duct connection
      125, 160, 200, 250, 315, 355, 400, 450, 500
 

Other Options and Accessories

IN  =  Insulation
          Y      Yes 
          N      No

OM = Adjustment device
          NA     Not assigned
          MS    MSM   
          RG    REG 

ZT = Tailored product
         N        No
         Y        Yes 
 

Code Example

        PDF/V-6-6-125,IN=Y,OM=Y,ZT=N

Downloads & Media

Halton PDF - fr
Type
Datasheet
Language
French (France)
Size
1,3 MB