Personal Air Conditioners (PACs) from ITW Vortec use filtered compressed air and vortex tube technology to keep workers comfortable in extreme heat or cold. PACs use the Model 855 or 857 Diffuse Air Vest to distribute cooled or heated air over the upper body. The vortex tube unit, worn on a supplied belt, cools or heats inlet temperature by ±60°F.ITW Vortec, Cincinnati, OH.