1 - Refractory Lining Thermal Modeller 1.04 The Refractory Lining Thermal Modeller (RLTM) is a software program for rapid modelling of heat flows through furnace, heater and kiln linings. It is available for Mac OSX, and Windows. Materials are dragged and dropped onto a lining model, and can be dragged to different positions and resized. License: Demo OS: Mac OS Size: 2.5 MB