*Minimum* Duct Length for ERV Intake?
I’m installing a Panasonic Whispercomfort ERV in a bedroom wall stud cavity, furred out to 7″ D. The runs are simple — 4″ vertical flex followed by a *rigid* 90 elbow through the wall (I’d rather (2) 45’s, but don’t want the chase to project too far into the room). The sealing and workmanship will be high quality.
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