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Re: Air handler plenum
Bill,
How old / new was the house?
I could not find any reference in the code which precludes flexible duct from being connected to the AHU ... I thought there was, but could not find it.
May be in the installation instruction. Do you take a photo of the nameplate? If so, you might be able to download the instructions from the web and see what they state regarding it, if they state anything.
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