A direct vent fireplace includes a heat deflecting baffle comprised of a base member attached to the front top edge of the fireplace and an extension member telescopically attached to the base member. Each end of the extension member includes a vertical flange with a track. The base member includes a vertical flange which is received in the track along with a catch means to permit selective movement of the extension member from a retracted position to a fully extended position or to positions there between.