​

Only ZEFIRO ducts feature an advanced thermochromic visual indicator with differentiated thresholds.

A smart, passive signalling based on thermochromic pigments, designed for real-time thermal flow monitoring in HVAC  systems.

The indicator dynamically changes colour across three intuitive states: red for warm air flow, blue for cold air flow, and neutral when inactive.

Engineered for maximum clarity and efficiency, it enables instant visual diagnostics even in elevated or hard-to-access installations, eliminating the need for electronic devices or external instrumentation.

A simple yet highly effective solution that delivers immediate, distance-independent feedback—enhancing system control, safety, and operational awareness.​