The renewal of air inside the shed is a factor that must be controlled, considering that the birds are responsible for producing the greatest amount of heat.An excessive increase in temperature and humidity can be controlled by removing the hot air and replacing it with fresh air from outside.Chickens for fattening are more vulnerable to high temperatures especially the last two weeks of life.The objective of this work is to determine the natural and forced ventilation for an open installation of chickens for fattening under confinement, built with conventional materials.The study is carried out at the El Perico farm, belonging to the University of Sucre, Department of Sucre-Colombia.Ventilation for hot weather is determined with the support of the psychrometric chart; considering the heat of the animals, heat transmission by the materials of the construction parts of the shed, based on the internal and external conditions of temperature and relative humidity.The total ventilation required in the installation is 43522.66m3/h, indicating that there is no problem with air supply since the area to ventilate is much less than that provided by the shed.There is an inconvenience due to the thermal sensation of the animals and humidity, so it is necessary to supply fans (mechanical ventilation) for the chickens, in a quantity of three (3).Each fan has a flow of 16000 m3/h and a power of 1.0 HP.