When it comes to glazed internal French doors, it is always a good idea to have doors with strengthened glass panels but it does not have to tempered. This will protect your doors and your family, in they accidentally slam the door too hard.
There are a variety of methods for strengthening glass. Tempering is only one of those ways - it is also possible to get glass that is laminated and either type of glass is strong enough to use in doors.
All Climadoor glazed internal French doors are supplied with safety glass as standard.