The air chiller is designed to lower the temperature of the eviscerated birds from about +38° C to approximately +2°/4° C by forced cooled air. The birds are hung on single bird shackle. Cattaruzzi s.r.l. has been the first company in the world in year 1982 to install a single shackle air chilling/grading line 1.200 mt. long and in 1992 a single shackle air chilling/grading line 4.127 mt.long.