The TWGHs Man Mo Temple at Hollywood Road and Shui Yuet Kung at Shan Tung Street have both installed Qing Yan Furnace which was designed by the Hong Kong Productivity Council. As both temples are popular and are located near residential buildings at the hub of the city, the installation of Qing Yan Furnace has greatly reduced the impact of burning joss papers on air quality. The environmental-friendly furnace has been found satisfactory in various environmental tests by reducing smoke in compliance with the environmental requirements.