A duct heater is a specialized heating unit designed to be installed within the air ducts of HVAC and industrial ventilation systems, where it heats the air as it passes through. Commonly used in commercial spaces, factories, warehouses, and various process heating applications, duct heaters provide precise temperature control and uniform air distribution. They are available in electric models, which use heating coils, or in steam and hot-water-based designs, and come in flanged or slip-in configurations to suit different installation needs. Built with robust heating elements, insulated frames, temperature sensors, and safety cut-offs, duct heaters ensure efficient performance and safe operation. Their ability to integrate seamlessly into existing HVAC systems makes them ideal for both comfort heating and industrial processes, with customizable sizes, capacities, and control options to meet specific requirements.