Abstract: A guard fixture is mountable on a fireplace grate of the type having a frame formed of a plurality of spaced rib members which extend fore and aft when the grate is placed in a fireplace opening. The guard fixture includes an elongate post which projects substantially vertically with respect to the grate frame. The post is mounted on the grate by a pair of flange plates, one of which is affixed to the bottom of the post. The flange plates are positioned on opposite sides of adjacent rib members, and are caused to be held thereagainst by a threaded bolt which passes between the adjacent rib members to mechanically couple the flange plates.