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Airport lounge application illustration with a low-level displacement diffuser beside the circulation area.
Architecture & air distribution

Displacement
diffusers

Integrated into
the occupied zone.

Coordinate low-level supply with waiting, working and circulation areas.

Explore the principle
Airport lounge
Cutaway illustrating cool air supplied at low level, rising thermal plumes and high-level extraction.
Airflow principle
The engineering behind the space

Engineered around the displacement principle.

Gerhman displacement diffusers introduce air cooler than the room at low level and with limited momentum. The air spreads near the floor before joining thermal plumes generated by people and equipment, carrying heat towards high-level extraction.

The perforated discharge surface forms the interface between the ventilation system and the occupied space. Diffuser geometry, airflow and positioning are selected together to support the intended air path and local thermal comfort.

Download theory (PDF) Explore diffuser range

Explore displacement diffusers

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Selecting a displacement diffuser

Displacement ventilation supplies cool air at low velocity near the occupied zone. Select the diffuser with its airflow, face velocity, temperature difference and near-zone characteristics in mind. Position regularly occupied seating outside the near zone indicated by the product data. For DD01, the catalogue also describes adjustment of the local discharge pattern. Check the chosen model’s connection and mounting arrangement rather than assuming all displacement diffusers install alike.

DD01 displacement diffuser

How is air velocity selected for displacement ventilation?

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