sentence: Fans can also be on a ceiling or in the ground.
sentences_before: A 'fan' is a device that people use for cooling themselves down. To cool yourself down with a handheld fan, you must wave the fan up and down near your face. Fans are used when it's very hot. People also use electric fans and air conditioners to make cooling themselves easier since they don't have to do all the hard work.
concept_name: fan
headings: Fan
categories: Machines