Download EN version here > Download JA version here > Download ZH version here > TEMPERATURE MEASUREMENT IN THE AIR-COOLING ZONES DOWNSTREAM OF THE LEHR ON A FLOAT GLASS PLANT Accurately measuring and controlling the cooling rates along the length of the glass ribbon and thermal profile across the width within the annealing lehr is common practice. However, with ever-increasing demand for quality, measuring and controlling the cooling rates in the air-cooling zones is becoming necessary to attain the float glass quality during the production of glass that is thinner or thicker than standard glass (window glass).