This document discusses different types of incubators and their operations. It describes still air incubators which do not have fans and forced air incubators which circulate air using internal fans. It also discusses basic incubators, advanced incubators, cabinet incubators, and multi-setting incubators. Multi-setting incubators provide different environmental conditions for different egg development stages. The document focuses on the Chick Master incubator system as an example and describes its laminar air flow system and multi-zone controls.