(b)(4), the customer returned the actual sample along with three representative samples.The manufacturing site has reported "from the investigation conducted on the actual samples, the complaint on white filter material was not confirmed.The defect was found after 5 to 7 hours usage time.Ifu mention that replace unit immediately if soiled with secretion or otherwise obstructed.Humid-vent is designed for single use only and should not be cleaned and re-used.In current manufacturing procedure, 100% visual inspection after assembly process is conducted.Thus, any ineffective products will be culled out during this process.Therefore, it is very unlikely condition at the manufacturing area that the product having white filter material be released for shipment.There is no similar defect observed at manufacturing site." a device history record review was performed and no relevant findings were identified.The root cause is listed as user related.
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