Standard and remote models are depicted in our Product Catalog and in our product pages. Any of these units can be altered to suit your requirements. References to belt speed and width are guidelines to help determine the proper heater and BTU requirements. Conditions can vary significantly due to exposure to wind and temperature extremes. A careful evaluation by Thermo-Tech personnel is the best way to determine the model for your application. Direct fired heaters cannot be installed on belts that go underground. For those applications, the Model MBH indirect fired heater must be used. The best practice is to interlock the heater with the power to the belt drive. This, in addition to the motion sensor provided with the heater, provides a double redundant heater shut down. If it is not practical to power the heater from the belt drive power source, dual motion sensors are provided with the heater.