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With very low sound power level for comfort zones with fixed air control blades. Circular and square ceiling swirl diffusers. For more Information see: https://www.trox.de/en/ceiling-diffusers/tdf-silentair-ce0ad7285456d6c6. Ceiling swirl diffusers with square or circular diffuser face. Supply air and extract air variants for comfort zones. Diffuser face with fixed air control blades for horizontal swirling supply air discharge creating high induction levels. For installation in suspended ceilings of all kinds. Ready-to-install component which consists of the diffuser face and a plenum box, side entry or top entry spigot, and suspension holes or suspension brackets. This EPD includes the environmental data of the product series VDR. The following represents a representative dataset of the most sold variant in the declared sales year (TDF-SA-Q-Z/400).