Plasterboard dryer could be 6, 8 or 10 desks. Capacity and plant area could be effect to desks of the plastrboard dryer. When plasterboard was feed to the dryer, inside of the dryer, plasterboard cross to high temperature in sort time, after that teperature going to low end of the dryer. When plasterboard left the dryer the teperature is appx. 70 ⁰C. For energy recovery we are using heat exchanger and we are making insulation with rockwool.