Form 3 in non-ventilated areas?

Where did you read about filters? As far as I know the exhaust is not filtered. Some users have said the Form 3 emits a stronger smell than the Form 2, mainly due to the addition of a heated chamber with a fan (whereas the older printer didn’t have any active circulation and just headed the tray using a PCB).

I keep my printers in a closet. I can smell it when I print, but closing the closet door helps. It’s not a repugnant smell, but it’s definitely quite noticeable.

IMO the alcohol fumes when you’re washing prints are more irritating than the resin, so if you’re worried about fumes you’ll want to plan to mitigate that (e.g. set up the wash station outside or in the garage?).

There have been a couple posts by people who built enclosures for their Form 2 printers (including air extraction through a filter). There are more examples if you search the forums.