The ‘HEF’ series of indirect fired heaters are designed to fire industrial process applications where process air is recirculated at relatively high plant operating temperatures. Operating air temperatures up to 400°C can be accepted. Heater capacities of thermal outputs from 60kW to 1200kW are available; special units to meet the requirements of a particular application can be supplied. The robust construction of the units makes them an ideal heat source for many industrial process plants.