Hmmm, what kind of sensor might be on a car parking level that is pretty deep underground...
                                                                               Hmmm, what kind of sensor might be on a car parking level that is pretty deep underground...                                      ask                                                                                                                     129 Likes                1 Comments                                       Lisa Tomlinson                                                                                                                    Deysa Dubovecka                     Based on a quick google this is part of their HVAC system, chances are it's a CO sensor that's connected to the dampers in the garage, when the levels get too high it sends a signal to open the shutters and allow fresh air in.