Rectangular Displacement Diffuser

Smartemp RDW-FD

Rectangular displacement diffuser for installation on the floor, in a wall or free-standing.

Displacement airflow
Thermal displacement room airflow, with low level mixed flow supply into the occupancy microclimate. Heat and contaminants rise to a high layer of stratification by natural convection. Enhanced levels of indoor air quality are attained in the breathing zone.

Wall location
Integrated into or abutting a wall.

VAV dependent throw
Horizontal throw dependent upon VAV airflow rate.

Fixed direction
Substantially horizontal air pattern.

Rectangular face shape
The diffuser face is rectangular.

Perforated face pattern
The diffuser face is made of perforated sheet metal.

Plastic face
Powder coated metal finish.

Airflow rate

  • ≤ 450 L/s; (1620 m³/h)


  • 5 – 15 m

Discharge velocity

  • ≤ 0.25 m/s

Sound power level

  • ≤ 30 dB(A)


  • Removable, robust perforated metal discharge face.
  • Removable air matt provides low turbulence airflow.
  • Installed individually or adjacent to one another.
  • Connection from above, behind or below.


The SMARTEMP Rectangular Displacement Diffuser, type RDW-FD, produces a low velocity horizontal airflow pattern through a removable air distribution matt located behind an openable perforated rectangular discharge face made of powder coated galvanised steel. Air oozes out of the perforated face with minimal mixing, to produce a low velocity, low level lake of high quality supply air that floods the floor with displacement airflow. A low level occupancy microclimate of enhanced indoor air quality is created, in which convective currents from heat sources such as occupants, equipment and lights rise upwards, drawing in high quality replenishment air from the occupancy microclimate, to envelope the heat sources in cooler, high quality air. Heat and contaminants stratify at a high level in concentrated form, where they are removed 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 (typically 20°C), thereby minimising fan energy. Energy savings also accrue from the extended free cooling range typically achieved by the elevated supply air temperature, as well as from the potential to reduce outdoor airflow rates due to the enhanced indoor air quality resulting from the improved ventilation effectiveness of the low level displacement supply.



Product Type


Airflow Direction

Face Material

Face Pattern

Face Shape

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