CADEL Zefiro 9 ducted air pellet fireplace insert 9 kW - with WiFiCADEL Zefiro 9 kW pellet fireplace insert with ducted air and Wi Fi Nominal thermal power of 9 kW Ideal for heating up to 90 m2 with an average height of 2. 7 m Zefiro 9 is CADEL 's pellet insert, ideal for bringing an old, unused fireplace back into use or for those who wish to install a concealed pellet stove in the masonry. An elegant black glass window reveals the flames that can heat rooms up to 90 square meters. The insert features a cast iron