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Wiktionary
fire screen

n. a mesh grill placed in front of a fire to prevent sparks escaping.

WordNet
fire screen

n. a metal screen before an open fire for protection (especially against flying sparks) [syn: fireguard]

Wikipedia
Fire screen

A fire screen sheet began as a form of furniture that acted as a shield between the occupants of a room and the fireplace, and its primary function was to reduce the discomfort of excessive heat from a log fire. Early firescreens were generally shaped as flat panels standing on attached feet, or as adjustable shield-shaped panels mounted on tripod table legs.

Firescreens in the modern home have become decorative shields of sheet metal, glass, or wire mesh that can be placed in front of a fireplace opening to protect the room from open flames and flying embers that may be emitted by the fire.

Fire screens were used to cover the fireplace when nothing was burning inside it, and make it look more decorative.