The third-generation Volu-Matic III from Unisul, Winter Haven, Fla., is designed to blow fiberglass, rock wool or cellulose insulations in attics and netted cavity applications. Features include an air-control system designed to allow the operator to adjust the volume of air without decreasing the pressure capability, a split-end safety guard to facilitate access to the feeder and an automatic back-pressure check valve to help keep material from being forced back into the blower when the machine stops blowing.