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I just got back from my 2020. I cut every other rib on the vents. Made a big difference in air flow.
I checked my returns and no collapsing of the ducting m it appears that they did make changes to the design. They added supports. They are hard plastic and seem to be doing the job without stopping air flow.
I still feel like my whisper quiet is moving less air than the regular 15k unit up front.
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