The Helios Fans ITEC 500 is a twin fan unit designed with a 100% standby feature to ensure continuous operation and airflow reliability in duct ventilation systems. Constructed with a durable galvanized steel casing, it provides excellent corrosion resistance. The unit features an access panel that can be positioned either at the top or bottom for convenient maintenance access. It includes standard change-over panels with a duty-sharing option to optimize fan usage and prolong equipment lifespan. Wiring is simplified via a common terminal box and change-over panel. The unit is acoustically lined to minimize operational noise and reduce sound breakout. Speed control is achievable with the Helios ACSW EC change-over panel paired with the PA10 potentiometer speed controller. Installation is straightforward thanks to the standard side mounting rails, making the ITEC 500 a reliable and efficient choice for duct-mounted fan applications.