Vents-US VK 315 is a duct-mounted inline centrifugal fan built for high static pressure systems. It uses a backward-curved impeller and sealed external-rotor AC motor (120 V, 60 Hz) in a UV-resistant plastic housing, and ships with an adjustable mounting bracket for easy placement along the duct. The connected duct diameter is 12 3/8 inches (about 31.4 cm). Manufacturer data indicates a maximum airflow of 871 CFM (approximately 1480 m³/h) at 0 in. w.g. The VK 315 supports continuous operation and installation in any orientation, making it suitable for long duct runs in workshops and light commercial ventilation projects.