So this thread is for people who would like to know how to use an Air Vent to trigger other actions. I'll include a test blueprint at the end of this post. Here's how to set up a vent to trigger actions. Select a vent in the control panel. Click on the "Setup Actions" button - the Toolbar Config screen comes up with two open toolbar slots The unmarked slot on the left is the event that will trigger when the room reaches 100% full of atmosphere (oxygen) The unmarked slot on the right is the event that will trigger when the room reaches 0% full of atmosphere (or 100% empty, your choice) Put action blocks in those two slots, similarly that you would with a Button Panel or Control Station/Flight Seat - they will trigger automatically when the vent reaches either state You're not limited to one event, you can put a Timer Block on one of the toolbar slots which could activate lots of events, and loops, and other timers, etc. For an example, see a simple station I made in the Steam Workshop. This is basically a small cube station with a few doors, interior lights, gravity and a button panel. Place it in a creative game in space, and enter the station through the man door (as opposed to digging your way in or opening the hangar doors - which are not accessible from the outside). Go to the Steam page for "Vent Test Station Alpha" and there will be specific instructions on how to set up the Air Vent using actions on that small station. I hope this helps, please feel free to leave comments below. Edit: The link now goes to "Vent Test Station Alpha", which is a slightly updated version of the station and includes steps for the user to "program" the vent themselves.