Cross-flow fans use a long, cylindrical blade design that moves air horizontally across the entire width of the indoor unit. This technology is standard in our Single-Zone wall mounts to provide a wide and even distribution of air. For large rooms, the Bravo Milano 24,000 BTU Universal Floor/Ceiling utilizes this fan to reach up to 30 feet from the unit. These fans are incredibly quiet, which is why our Wall Mounts (2 Zones) are popular for bedroom installations. To keep the fan blades clean and silent, we recommend using the air purification Other Accessories available on our site. Our Installation Kits ensure the unit is level so the cross-flow fan remains perfectly balanced during operation. It is the secret behind the "silent wind" that Bravo Milano users love.