On April 20, Patrick Stalder, the president of Siga from Switzerland and his colleagues visited China International Windoor City. They visited China's first passive integrated demonstration building, windows and doors physical performance center, china windows and doors museum and other pavilions.

After the visit, he had a meeting with Deng Bintao, the expert of windoor city passive building.

Stalder said, in the promoting conference of the 4thfestival last year, he had already a certain acquaintance to the scale of the windoor city.After this visit, he had a bigger shock to the exhibition platform of energy-saving building products with so huge scale in windoor city. He hopes that he can attend the 4thwindoor festival and make use of this platform to bring the advanced waterproof materials in China, as well as common develop with windoor city.