Md. Ziaul Hasan, Secretary of Environment, Forest and Climate Change Ministry, unveils a new model of eco-friendly AC titled ‘Inverna’ while visiting Walton factory at Chandra in Gazipur on Saturday. Additional Secretary Mahmud Hasan, Senior Assistant Director Shahidul Hoque Patwary and Assistant Director of Department of Environment in Gazipur Ashraf Uddin also visited the factory.