What is a flat piece of scenery that typically features a fireplace?

A flat piece of scenery that typically features a fireplace is referred to as a "fireplace flat." This term specifically describes a flat piece, which is a lightweight frame covered with a material to create a visual element on stage. A fireplace flat is designed to represent a fireplace as part of the set, helping to establish a location and create atmosphere in a production.

While the other terms like "backstage flat," "stage flat," and "decorative flat" describe various general types of flats used in theatrical scenery, they do not specifically indicate that the flat includes a fireplace design. Backstage flats are usually used for scenery not visible to the audience, stage flats are general pieces that make up the stage environment, and decorative flats refer to any flat designed for aesthetic purposes without a specific feature like a fireplace. Thus, the term "fireplace flat" is the most accurate in this context.