The steam can be vented into the cold water tank in the attic. If this can be done it is the easiest solution
Still stuck on shower fan venting into attic space - I have used flexiduct to bring it over near a soffitt vent but I know this will cause condensation inside the duct in the cold attic
it's a plastic dome that fits over the top of the shower so it keeps the hot moist air in there with you and doesn't let it escape into the room.