Primary, secondary, and tertiary air is completely preheated by passing first beneath the base and then through a cavity located at the bottom of the combustion chamber. This ultra-high-temperature air combines with carbon monoxide—which is not fully burned during the initial combustion phase—triggering secondary and tertiary combustion. This process minimizes pollutant emissions to such an extent that the system achieves a 5-star Environmental Class rating and is certified for the Conto Termicowith the maximum incentive factor. Key Mechanical Features: Patented Anti-Jamming Door: Features a vertical disappear-away (retractable) door that is patented against jamming. It can also be opened laterally for glass cleaning. Air Wash System: The internal surface of the door allows a "curtain of air" to pass through, effectively preventing the glass from blackening with smoke.