with direct drive motors and variable pitch, field adjustable impellers For supplying, circulating and removing air, fumes, smoke and mists in applications demanding dependable, long-life fans at lowest possible cost. Strobic direct drive tube axial fans are designed for long, reliable service lives. They offer maintenance-free performance, and are ideally suited for use in areas that may not be easily accessible. For added flexibility to meet most applications, fans may be mounted in any position – horizontally, vertically or angularly – either in or out of the duct system.