Ceiling diffuser – PLI

PLI is a square ceiling-mounted air diffuser designed for flush installation in false ceilings. It offers compatibility to most of the common modular systems in the scandinavian market and is further adaptable to other ceiling systems. It features a recessed circular slot opening combined with an aerodynamically shaped rear section, enabling smooth 360-degree horizontal air diffusion. As supply air enters the room, the airflow adheres to the ceiling surface due to the Coanda effect, minimizing the risk of draughts in the occupancy zone, even at low airflow rates or when supplying cooler air.

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  Flush installation

  The PLI diffuser sits perfectly flush within modular ceiling grids, creating a clean, uniform surface. This discreet integration supports a seamless architectural finish, ideal for offices, retail, and other visually sensitive spaces.

  

  Cooling performance

  PLI can handle supply air up to 10°C below room temperature while maintaining comfort in the occupied zone. The 360° spread pattern, combined with the Coanda effect, allows cool air to spread, minimizing draught risk even under high cooling demand.

  

  Dual functionality

  Primarily designed for supply air, a PLI unit can also be used for extract air. Its consistent external form supports visual uniformity throughout the building and simplifies design and installation.

Optimal circulation

As supply air exits the diffuser at high velocity, it forms a narrow jet that entrains surrounding room air – a process known as the induction effect. This draws ambient air into the airstream, resulting in rapid mixing between supply and room air. At the same time, the jet tends to follow the ceiling surface due to the Coanda effect, which extends the throw distance before the mixed air descends into the occupied zone. The combined effect balances room temperature, and enhances thermal comfort.

Designed for a consistent appearance

The PLI features a standardized front panel that remains identical regardless of the duct connection size behind it. This allows airflow and performance to be adapted to room needs without altering the visible design. Whether in open-plan areas or smaller spaces, the consistent faceplate ensures a clean, unified appearance that aligns with modern interior design standards.

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  Sound levels

  When paired with a commissioning box, the diffuser benefits from the sound-absorbing insulation. This reduces operational sound generation, which is important in most premises. The installation with a box also enables more precise airflow settings when commissioned.

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  Easy installation

  The diffuser is designed for quick, secure installation in standard modular ceilings. Removal of the front plate requires no tools and allows easy access to the commissioning box and its components during installation, commissioning and maintenance.

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  Commissioning box options

  TK Our flagship commissioning box, with a low build height featuring environment friendly sound absorbent insulation, a supply air distribution plate and a removable damper module for commissioning and measuring of the airflow. The low height is possible by the inward facing socket design of the diffuser connection, minimising the total height of the diffuser and box, when assembled together.

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  Cooling performance

  The PLI diffuser can handle supply air up to 10°C below room temperature while maintaining comfort in the occupied zone. Its 360° diffusion pattern, combined with the Coanda effect, allows cool air to spread evenly along the ceiling, minimizing draught risk even under high cooling demand.

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  Ease of maintenance

  Routine maintenance is simple and safe. The front plate can be removed without any tools, streamlining cleaning and inspection. A built-in safety cord prevents accidental drops during removal or handling, ensuring both user safety and product protection.

Learn more

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