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Positive/negative pressure ceilings

Air permeability of OWA metal ceiling systems

Clean room ceilings are not just identified by their emission behaviour. Another decisive factor is how they delineate areas of lower and higher cleanliness classes from each other, and how they react to the different air streams that occur in clean rooms. This delineation is achieved by means of two different concepts: the displacement and the pressure difference concept. In either case, the ceiling system must be able to withstand the differing high pressures of the clean room. In other words, the ceiling must be as leak-free as possible. For this purpose, the joints between the ceiling tiles are carefully sealed, as is the connection between the wall bracket and the ceiling tile and between the wall bracket and the wall.

OWA positive/negative pressure ceilings according to DIN EN 1026 and DIN EN 12207

To classify the OWAtecta S 22 ceiling systems, the Fraunhofer IPA in Stuttgart performed pressure checks based on DIN EN 1026 and DIN EN 12207. The ceiling system was installed in a test box that was designed especially for this purpose and hermetically sealed. In addition, standard integrated lighting OWA-Opal was installed in a module in the ceiling system and similarly hermetically sealed. The system was then subjected to a positive pressure of up to +80 Pa and a negative pressure of up to –50 Pa and the leak rate of the test pieces was determined.

Result: proof of qualification of the air permeability in “Class 4” of the OWAtecta System S 22. The S 22 ceiling system complies with the tested pressure tightness as well as the requirements regarding air permeability in clean rooms and is therefore ideally suited for use in a large number of clean rooms and clean room areas.