the detectors should be placed on the wall 5 feet above floor level and in a location that is free from heat sources. They also need to have their doors open so they can detect particles such as carbon monoxide which may rise up due warm, rising air currents Carbon dioxide levels are crucial because this gas does not emit any light but it absorbs infrared radiation; therefore an accurate detector must measure its amount with great accuracy for you to benefit from early warning signals if there’s ever been toxic pollution at work indoors!