The main purpose of ventilation in poultry farming is to control the temperature of the hall. The interesting thing to note is that birds need an optimal temperature range or range at each stage of their growth so that they can convert the energy in the feed into growth with the best efficiency. Basically, this thermal range (Optimal performance) is called temperature zone. For example, the optimal temperature for good performance of one-day-old chickens is 32 degrees Celsius and at the time of slaughter 21 degrees Celsius. If the poultry management can provide the appropriate temperature In that case, the conversion efficiency of the energy in the feed to the muscle and bone tissues will reach its maximum value.