As a Verb or Adjective: 1. VENTILATE means to allow fresh air to move around in a building, for example, by using fans to move air from one area to another. Note: 1. The signer in the video is giving an Auslan explanation of the English key word VENTILATE. There appears to be no commonly used Auslan sign for VENTILATE (but some signers represent this visually using depicting signs, once they have established the topic). If you know a sign for VENTILATE used by you or other Auslan users (deaf people or interpreters) please go to "Report missing sign" and supply details. Thank you.