Said to be ideal for both attic and netted cavity insulation, the Volu-Matic III is the third generation of insulation blowing machines from Unisul, Winter Haven, Fla. It features a more rugged drive system and incorporates an air-control system that allows the operator to adjust the volume of air without decreasing the pressure capability. Other changes include a redesigned air-lock feeder, a more streamlined fiber shredder, a split end safety guard to facilitate access to the feeder and an electrical interlock to disable the drive mechanism when the front safety guard is opened.