Hi Bill. I was refering to bathroom exhaust fans. They sell many that are "ductless" with a charcoal filter. They are not permitted because exhaust is required to go to the exterior, as discussed earlier.
As far as the glazing goes, if you have 1.5 square feet of openable glazing in the bathroom you need not provide a fan, but if you do, it must duct to the exterior.
If you want some real fun reading with glazing, read the "hazardous glazing locations" section in the IRC/IBC, and try to make sense of it...see ya in a few years!
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Lots of controversy in that section.
