Transoms

Here's a look at an interior transom window. I will add a picture of one not damaged as soon as I get one.

 Transom windows were designed to allow air flow in the days before air conditioning. Located above the inner doors they are usually opened from the top and can be decorative as well as functional.

 While this design does allow for air circulation it also allows the products of combustion to easily and rapidly extend out of the fire room and into the hallway.

 Fire Prevention laws do not allow the use of the windows when they lead into public hallways, but do not be surprised if you come across them in older buildings. They also seem to be enjoying a Renaissance lately as more and more people renovate older homes.

 The picture shows not only a transom but also lath & plaster walls.