Bathroom fans and a service cavity
I am planning to have a service cavity beneath the air barrier of the ceiling of my home that I am building. This will consist of taped plywood attached to the underside of the roof trusses to form the air barrier, 2×4 furring to create a service cavity, and drywall attached to the furring.
Now that it is coming up, I am wondering what to do about my two bathroom fans? I am planning Panasonic Whisper fans installed in the ceiling, and it looks like the duct goes out the side from them. The ducts are either 4″ or 6″, but either way, they will be too tall for a 4 inch service cavity (especially since 4″ is not really 4″ in lumber). How do I do this without carving a big trench all the way from the fan to the wall?
Is it possible to vent the fans up instead of sideways?
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