Plantation shutters can and are often used as interior doors and partitions. This is especially true in commercial applications. The primary reason louvered doors are often use is to provide privacy, or create a definitive space, and still allow for air circulation. Dressing rooms and bathrooms stalls are both areas that you might frequently see a louvered door in commercial buildings.
In a residential application, these are frequently seen as doors in closets, water closets, or between rooms.. ie kitchen to dining.
Important things to know when using shutters as doors-
1) consider depth ~ if the door is going into a door jamb opening, pay attention to the depth of your jamb. For a water closet or closet door a standard shutter depth will usually suffice (Kirtz standard depth is 1 1/4″), but a standard interior door is usually 1 3/4″. Be sure to choose a manufacture that can provide this custom depth (Kirtz can, and frequently does this depth of shutter)
2) consider design ~ will the appearance of a standard shutter work? Many plantation shutter manufactures use a drop rail construction. This means that the rail (horizontal solid member) is not as deep as the stile (vertical side member) of the shutter. Doors typically have a flush stile and rail configuration (all the same depth). If this is your preference, be sure to specify it.