Direct fired heaters are a type of heating system that generates heat through the combustion of fuel within the heater itself. They are commonly used in industrial applications where high temperatures are required for processes such as drying, heating, or curing. These heaters are known for their high efficiency and quick response time, as the heat is directly transferred from the combustion process to the material being heated. Direct fired heaters can operate on various fuels, including natural gas, diesel, and propane, offering flexibility based on the availability of fuel. They are ideal for applications where rapid heat generation and precise temperature control are essential.