The Helios Fans KWL-ET 270/370 is a high-efficiency enthalpy heat exchanger designed to enhance indoor comfort through the recovery of both heat and moisture. It operates using a hygienic polymer membrane in a cross-counterflow configuration, ensuring optimal energy efficiency and a consistent feel-good climate in all seasons. Ideal for integration into compatible Helios ventilation units, this exchanger improves air quality while reducing the need for additional heating or humidification