The ICAVI Fixed Grate combustion system was specially developed for applications using firewood logs and larger solid biomass fuels, providing operational simplicity, robustness, and thermal efficiency. Its operation is based on feeding the fuel directly onto the grate, allowing the material to move by gravity throughout the combustion process. The grate inclination is designed to ensure continuous fuel flow, promoting combustion stability and improved energy utilization during operation. Each grate section features an independent air plenum system, allowing airflow adjustment according to fuel distribution across the grate and ensuring better operational combustion control. The ICAVI Fixed Grate is recommended for industrial applications requiring a robust, reliable combustion system compatible with larger solid fuels.