The fire-resistant mortise door lock ES 984 is intended for use in fire-resistant doors. The faceplate is galvanised and rounded so that the mortise lock can be optimally installed in a wide variety of fire doors. The bolt and latch are centrally positioned in the lock. The fire-resistant mortise lock can be used with DIN right-hinged and DIN left-hinged doors and screw-on fittings and rosette fittings can be fitted easily thanks to the DIN-standardised holes in the lock.