Plenum for Halton DFB diffuser
Plenum sizes for Halton DFB diffusers are shown in grey rows in table above.
|Plenum box / spigot||Galvanised steel|
|Sound attenuation material||Mineral wool||The mineral wool is fixed
|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
|OM||For supply application|
|Airflow adjustment unit||REG||For supply application|
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
4. DFB or DFC plenum
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.
The diffuser is attached to the plenum via clips.
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):
|Spigot Diameter||> 6xD||min 3xD|
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.
Detach the diffuser, clean the parts by wiping with a damp cloth.
Push the diffuser back into place by clipping the plenum.
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.
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.
S = Model
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
IN = Insulation
OM = Adjustment device
NA Not assigned
ZT = Tailored product
Y Yes (ETO)