Assertion: flex duct | /r/CapableOf | question its use
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Source sentences:
text: It does not look as if the missing flex duct liner was due to mechanical damage - as I see that where no plastic liner is visible, there are straight edges along the apparently-missing liner - not something that would normally happen by a cleaning attempt for example; Nor is missing flex duct liner an installation defect, unless you want to argue that the installer should have noticed that the flex duct seemed peculiar and should have questioned its use.