The invention is a device to automatically open a/the garage door when the CO2 reaches a certain level. The door(s) can not be closed unless the CO2 level is safe/normal. Why the fuck didn't any of us think of that?
Because nobody wants to explain to their insurance company how the burglar managed to unlock the door from the inside with nothing more than a length of hose attached to the exhaust of their getaway vehicle? But don't worry, I have a solution. It's a device that allows gases to escape through a tube that is too narrow for a person to fit through. I call it a "ventilation duct". Please give me $5M to develop this idea.