Abstract: A firebox cabinet comprising a front panel, two side panels and a top panel is disclosed, the cabinet mounting flush onto a firebox having a mounting flange. The front panel contains an opening corresponding to the front firebox face, and two recesses surround this opening, the first adapted to receive the mounting flange, the second adapted to provide clearance for fastening members. The front panel locks onto the mounting flange, and the cabinet is preferably of modular construction whereby the components are joined together with self-interlocking joining means.