The Vektor line of laboratory exhaust systems now includes a direct-drive Arrangement 4 option, which is available on Vektor-MH (high plume), Vektor-MD (high plume with dilution), and Vektor-MS (variable-geometry nozzle) models. The design combines a lightweight aluminum mixed-flow impeller with an industrial-duty motor to provide ultra-smooth and efficient operation. Maintenance is reduced, as the motor does not require lubrication for up to one year. The design allows the motor to be serviced safely without the fan having to be disassembled.