With Cover. The GU L-0002-02 comes supplied with a cover for a neat and tidy finish, it is for use on fire rated single and double leaf doors, and can be used on right or left mounted doors. With an adjustable size of 2 - 4, this door closer is suitable for use on fire and smoke doors and is tested to 500,000 closing cycles.. For use on fire rated single and double leaf doors - standard door mount pull side application. Suitable for use on fire and smoke doors. Power size EN 2-4 determined by template mounting position. FD120 fire approval for timber doorsets; FD240 approval for metal doorsets in standard (Fig.1) and parallel arm (Fig. 6) configurations