This technical note sets out preliminary guidelines for the design and construction of vent pipes for ventilated improved pit (VIP) latrines.
RYAN, B.A. MARA, D.D. (1983): Ventilated Improved Pit Latrines: Vent Pipe Design Guidelines. (= UNDP Interregional Project INT/81/047 ). Washington: The World Bank, United Nations Development Programme (UNDP) URL [Accessed: 31.01.2014]