Fire door sensors are installed to detect any leakage either from the fire door or from any other part of the building. This can alert the fire brigade, so they know as well what the exact problem is. Regular fire door inspections should always include a gauge of some sort, because if you don’t you’ll never know if there’s anything wrong with your system. A lot of people don’t think they need to keep an eye on the fire door, but the fact is that you should and it’s important to do so. Contrary to regular fire door sensors, fire door gap gauges must have no more than a 8…