(b)(4).The sample was returned for evaluation.A visual exam was performed and it was observed that the filter appeared dark and moist.This can happen due to the accumulation of condensation, secretions, or contamination after usage.The instructions for use (ifu) states to regularly monitor the patient's need for additional humidity, and to replace the filter every 24 hours or less, as required.At the manufacturing site, 100% drop testing is conducted; therefore, any blockages would be detected prior to release.Based on the visual inspection, the product was assembled correctly.In addition, 100% drop testing was conducted at the manufacturing facility.The reported failure may occur due to the accumulation of condensation or secretions after usage.A conclusion code could not be chosen as a root cause could not be established.
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