Knut Bø AXC 315 is an axial in-line duct fan sized for 315 mm circular ducting. The impeller is direct-driven by a compact motor mounted inside the flow path, giving high air-transfer capacity with a short installation length. It bolts between flanged duct sections and is used to boost supply or extract in ventilation runs. Typical applications include commercial kitchen extract, workshop ventilation, and industrial process exhaust systems.