Circular Diffuser

Type CDN

CDN series circular diffusers are designed for use in air conditioning, ventilation and heating systems. They are suitable for mounting in false ceilings and the circular shape assures a uniform air diffusion in all directions which provides a high level of induction rate to the air in the atmosphere.They can be used in premises up to four metres high and with a temperature differential of up to 12°C, obtaining good results not only in distribution, but also in sound pressure level in the comfort zone.

The cores are fixed providing an economical method of manufacture, however, we can now spin the whole of this diffuser into a 595mm or 599mm plain or recessed plate to completely replace the ceiling tile, a detail of which is shown overleaf. Diffuser sizes are available from 150mmØ up to 400mmØ neck.

Recommended Velocity

DCNV min m/sV max m/s
1602.54.5
2002.54.5
2502.54.5
3152.54.5
3552.54.5
4002.54.5

The frame and spinnings and surrounding outer square plate are all manufactured from aluminium HE30.

The smallest neck size available is 150mmØ up to a neck size of 400mmØ. The largest overall plate size is 1195mm x 595mm containing two diffusers.

Standard finish is milled aluminium, however, most units are now polyester epoxy powder coated in a range of colours from the RAL list.

Either by concealed fixing into plenum box at rear, or by mounting in a flat plate for laying in a ceiling to replace a tile.

Diffusers made with aluminium spining. All diffusers are provided with a seal on the back of the frame in order that the perimeter in contact with the ceiling is airtight.

R3E – Flap damper assembled in the diffuser neck. Manually operated. Constructed in galvanised steel.

PLDN – Plenum box with a lateral circular connection. It includes supports to hang from the ceiling. Made in galvanised steel.

-R – Plenum box with a flow damper in the spigot.

/S/ – Plenum box with an upper circular neck connector.

/AIS/ – Plenum box thermoacoustically insulated by foam with a coefficient of thermal conductivity of 0.04w/mk.

Foam complies with fire specifications:
UNE 23-727 M2
UNE 92-501 M2
DIN 4102 M2

DCN – Circular Diffuser with fixed core.
DCN diffusers are provided with a seal on the back of the frame in order that the perimeter in contact with the ceiling is airtight.

DCN-MOD – DCN diffuser specially designed to replace a 600×600 false ceiling tile.

Plenum with circular adaptors. It includes supports to hang from the ceiling. Made in galvanised steel. The plenums can be supplied with a damper. Optionally, the plenums are thermoacoustically insulated by foam with thermal conductivity of 0.04 w/mk.

Foam complies with fire reaction specifications: DIN 4102 B2 Class ‘O’.

PMN – Hidden fixing with a crossbar and central screw. Suitable for mounting in false ceiling with rectangular duct. Constructed in galvanised steel.

PFLEX – Hidden fixing with a circular crossbar by means of a central screw. Suitable for mounting in false ceiling with flexible duct.

PLDN – Connection into the plenum box by means of central screw, to hang the assembly from the ceiling with drop rods.

To regulate the flow in plenum box mounting, we suggest the PLDN-R that incorporates a damper in the plenum.

Polyester powder-coated in the following colours:

RAL 9006 – Silver

RAL 9010 – White

RAL – Other colours at an additional cost.

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