The purpose of an air gap is not really to allow air to escape but rather to keep dirty water from back flowing into the DW. An autovent allows air into the system to allow for proper drainage and an air gap is not dependant on one or vice versa. The autovent takes the place of a vent stack to the roof.
Sudan is a member of the United Nations, the African Union, the Arab League, the Organisation of Islamic Cooperation and the Non-Aligned Movement, as well as an observer in the World Trade Organization. Its capital is Khartoum, the political, cultural and commercial centre of the nation.
The country's place name Sudan is a name given to a geographical region to the south of the Sahara, stretching from Western to eastern Central Africa. The name derives from the Arabic bilÄd as-sÅ«dÄn (Ø¨ÙØ§Ø¯ Ø§ÙØ³ÙØ¯Ø§Ù), or the lands of the Blacks , an expression denoting West Africa and northern-Central Africa.he Blue and White Nile rivers meet in Khartoum to form the River Nile, which flows northwards through Egypt to the Mediterranean Sea. The Blue Nile's course through Sudan is nearly 800 km (497 mi) long and is joined by the Dinder and Rahad Rivers between Sennar and Khartoum.