The addition of a vent pipe to a simple pit latrine is one way of reducing the nuisance of flies in the cubicle if the cubicle is kept clean and dark. This type of latrine is called a ventilated improved pit (VIP) latrine. There are a number of designs to suit different situations but they all work in much the same way. This guide describes how they work and presents various designs and design details.
This guide was published by the Water, Engineering and Development Centre (WEDC) at Loughborough University.