Unit was returned for evaluation.The dusting described by the adverse event form could not be detected while testing the visionaire oxygen concentrator in question.Visual inspections of the outside and inside of the unit did not find any damage or any accumulations of dust.Additionally, functional testing showed that the concentrator test unit is undamaged and it operates within its functional specifications, both in its output flow and in its oxygen purity.No abnormal behaviors or alarms were observed during extended periods of use.
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