Non-permeable System
Air supply only through distribution elements.
Air flows only through perforation thanks to zero fabric permeability
Non-permeable textile diffusers are made from a zero-permeability material (DFC-0), meaning that all supplied air enters the room exclusively through precisely defined openings, either in the form of DFC perforation or nozzles.
This principle allows for accurate airflow direction, higher outlet velocities, and thus targeted ventilation, cooling or heating in spaces with greater ceiling height.
Non-permeable fabric does not allow for any moisture diffusion. If the supply air is significantly colder than the surrounding environment, condensation may occur on the surface of the diffuser. This is especially the case when the dew point temperature in the room exceeds the surface temperature of the fabric.
It is therefore essential to consider operating conditions, humidity levels, and temperature gradients already at the design stage, to ensure the system performs reliably and without undesired effects.
Cooling at a temperature difference of 3°C
Non-permeable systems are designed so that air exits exclusively through perforations or nozzles – in a precisely defined direction and at higher outlet velocity. This principle enables rapid airflow projection, stronger induction, and effective air mixing, which is particularly beneficial for cooling at greater heights or in dynamic environments.
What improves in terms of efficiency may come at the expense of comfort.
Higher outlet velocities often bring the risk of draught, especially if the airflow is directed into the occupied zone without enough distance for deceleration and mixing.
Another critical concern is condensation. When cooling, it is essential that the supply air temperature does not fall below the dew point of the surrounding air – otherwise, moisture may condense on the surface of the diffuser.
And since DFC-0 fabric is non-permeable, humidity has no way to escape.
Efficient ventilation
the goal is neither heating nor cooling, but to efficiently mix the air in the room and ensure hygienic air exchange.
Non-permeable systems use targeted distribution elements (such as DFC perforations or nozzles) that enable air delivery at higher velocities and in precisely defined directions. This ensures quick and uniform air mixing without dead zones – even in complex layouts or spaces with high ceilings.
Heating at a temperature difference of 3°C
For heating, the non-permeable system is a logical and efficient choice. Air is delivered through perforations or nozzles at higher velocities and precisely directed to ensure it reaches the occupied zone.
This approach eliminates the natural tendency of warm air to rise immediately after leaving the diffuser. With sufficient kinetic energy, the air flows horizontally or diagonally downward, mixes with the room air, and evenly warms the entire space without overheating the upper layers.
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