Cylindrical Plug-flow Diffuser

Smartemp CP-AD

Adjustable pattern plug-flow air supply from up to 3 m discharge height in industrial applications for spot cooling/heating and to purge contaminants from work areas.

Plug-flow discharge
Low turbulence substantially uni-directional airflow to sweep away contaminants and provides spot cooling/heating.

Ceiling location
May be suspended above workspace.

Wall location
May be located adjacent to a wall.

Floor location
May be located on the floor.

Adjustable direction
Air pattern adjustment from slightly inclined to vertically downwards, for draught-free cooling and effective heating.

Manual adjustment
Manual air pattern direction adjustment.

Drum face shape
Cylindrical shape.

Perforated pattern
Perforated face.

Metal Face
Galvanised or powder coated metal finish.

Airflow rate

  • ≤ 2 800 L/s (10 000 m³/h)

Nominal sizes

  • DN250
  • DN450
  • DN560
  • DN630

Primary penetration radius

  • ≤ 14 m

Maximum supply air penetration radius

  • ≤ 20 m


  • Low-turbulence plug-flow purges contaminants for enhanced IAQ.
  • Well suited for spot cooling and heating
  • Placement at approx. 3 m height or on the floor, free standing in room or in front of a pillar or wall
  • Radial discharge pattern
  • Stepless air pattern direction adjustment from slightly inclined to vertical downflow
  • Adjustment by hand, electric actuator or self-acting thermal wax-bulb in the supply air stream


The SMARTEMP Cylindrical Plug-flow Diffuser, CP-AD, is suitable for industrial applications, from floor level up to 3 m discharge height, to produce a stable plug-flow air pattern from the diffuser to purge contaminants from the work space. The upward/downward direction of discharge pattern is adjustable (optionally by electric actuator or by means of a supply-to-room temperature differential self-acting thermal wax-bulb). Suitable for ∆Tsupply-room ≥ -10 K when cooling and ≤ +10 K when heating, and Tsupply ≥ 18°C if the diffuser is located at or near floor level.

The perforated cylindrical discharge face is made of galvanised steel that may optionally be powder coated. Air is discharged from the perforated face with minimal mixing to produce a relatively low velocity plug-flow air stream. Spot cooling/heating and contaminant purging occur in the airstream primary path. When cooling, a low level occupancy microclimate of higher indoor air quality is created in the vicinity of the diffuser, in which convective currents from heat sources such as occupants, equipment, machinery and lights rise upwards. This draws in higher quality replenishment air from the occupancy microclimate, to envelope the heat sources in cooler, high quality air. Heat and light contaminants stratify at a high level in concentrated form, to be removed from the space. Where heavy contaminants (such as particles) also need to be purged, it is recommended that these by removed at a low level from the space.

Due to stratification of heat, relatively large supply-to-return temperature differentials are achievable – dependent on ceiling height – despite the relatively high supply air temperature, thereby minimising fan energy requirements. Energy savings also accrue from the extended free cooling range often achieved by the elevated supply air temperature, as well as from the potential to reduce outdoor airflow rates due to the improved ventilation effectiveness of the plug-flow industrial displacement air pattern.

Electric adjustment
Airflow pattern adjustment (upwards for cooling; downwards for heating) by means of electric actuator with 24V AC/DC power supply and 2-10 V analogue control input.  Well suited to supply-to-room temperature differential control for optimised cooling and heating performance, providing effective downward heat penetration and draught-free operation year round.

Thermal adjustment
Self-acting wax-bulb up/down discharge direction adjustment – no external power source or controls required. Cool supply air is directed upwards providing draught-free air motion, and warm supply air is directed downwards for effective penetration of heat to a low level. The discharge direction bias is manually adjustable.


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Airflow Direction


Face Material

Face Pattern

Face Shape


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