Air terminal devices for circular diffusers



Air terminal units of UDO series are constituted by a adjustable cone circular diffuser by micrometric screw with insulated plenum complete of calibration damper.

UDO series units are applicable both on ceiling and false ceiling or distribution system at view  for supply air.

Plenum or calm box, allows to eliminate or reduce the no-uniformity of the velocity profile of the air coming from the supply duct. In this way, the throw characteristics of the diffuser will comply with those laid without asymmetry or directionality caused by unwanted velocity gradients.

Cestaro Bernardo Srl is able to offer in a short time both standard and special constructions of dimensional and construction specifications required by the customer.


Structure and dimensions


Material:                       Aluminum

Standard finish:             Anodized or white RAL 9010

Fixing:                          by hidden screws on the diffuser neck

For special construction, the surface finish can be carried out in RAL colours not standard by powder painting.

Calibration damper

Material:                       galvanized steel

Fixing:                          by dap joint

For special construction, the damper can be made of aluminium.

Insulated plenum

Material:                       galvanized steel

Isolation:                      out side

Fixing:                          by screws

Connection:                  lateral side

Regulation:                   by calibration damper

For special construction, the plenum can be supplied without isolation and with equalizer.

Heat insulating material

Polyethylene adhesive in Class "1" reaction to fire (DM 26/06/1984). Applying external standard. Internal application on request.

Use condition

Maximum operating temperature: 70 °C


Standard from diameter 100 to 630 mm.


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