Qn# (b)(4).The sample was sent to the manufacturer (sunmed) for investigation.The manufacturer reports: "the returned unit's facepiece was found to have a separation occurring at the seam.There are multiple variables, both through the manufacturing process, as well as in the end user environment that could contribute to this failure mode.A look at the batch records confirms that this appears to be an isolated incident with lot 012020 and furthermore, the tubing thickness was measured and found to be within specification." based on the investigation performed, the complaint was confirmed; however, a root cause could not be established.
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