Well, the way I programmed it, they are lumped in with the remaining channels. There's no "on/off" for them.
Looking at the manual I see there's a special method to add NOAA channels via the radio itself:
Since I programmed it via CHIRP I'm guessing I'll need to delete the NOAA channels I've created, manually add them via the above menu item, and they'll be automatically skipped.
Looking at the first image/CSV I grabbed before making my changes, I don't notice any fields that contain a hint that they need to be skipped, other than the naming convention:
NOAA01
NOAA02
NOAA03
NOAA04
NOAA05
NOAA06
NOAA07
I wonder if simply ensuring the names are exactly as above will automatically omit them from scanning.
I'll report back with my findings.