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Ventilation grilles, made of galvanised sheet steel, with individually adjustable, vertical blades, for installation into circular ducts. For more information see: https://www.trox.de/en/duct-installation/trs-r-08d7fe64994021d8. Ventilation grilles, rectangular, made of galvanised sheet steel, for supply and extract air. Aesthetic sloped border with chamfered inside edge Installation preferably in circular ducts. Ready-to-install component which consists of a border and individually adjustable, vertical blades. Countersunk holes for fixing the grille to the installation surface. Sound power level of the air-regenerated noise measured according to EN ISO 5135. This EPD includes the environmental data of the product series TRS-R. The following represents a representative dataset of the most sold variant in the declared sales year (TRS-R/RD/425x75/0).