In this type the impeller and motor assembly is placed in a tubular casing having a provision for angular adjustment so as to channelise the air stream in the required directions. It is portable and stands steadily even on rough surface.
Both the type are capable of being swiveled both in horizontal and vertical plains thus covering wider area of air circulation. Motors are generally available for 400/440 volts 3-phase 50c/s a.c. supply.