The Helios EHR‑R 1,2÷200 is a closed tubular heating element constructed from stainless steel, designed for installation in standard commercial duct systems. It features a durable duct casing with a terminal box made from galvanised sheet steel. The heater operates at a low surface temperature for safe use and includes an automatically resetting temperature limiter activated at 50 °C, alongside a manually resettable limiter triggered at 120 °C. This design ensures effective and reliable temperature control within ventilation ducts.