A supersonic air knife having a compressor and a barrel and nozzle includes an adjustable grasping handle assembly forming barrel handle comprising i) a pair of clasping elements, each clasping element having two gripping surfaces configured to engage the barrel at a point of engagement, with one point of engagement on each side of a first centerline of the barrel; ii) a pivot pin coupling the two clasping elements together on one side of the centerline of the barrel; and iii) A handle with a threaded element engaging the pair of clasping elements configured to draw the clasping elements together around the barrel.