Similar to positioning a smoke detector, you need to choose the right location for a natural gas detector in order for it to be effective. For plug-in models of natural gas detectors, such as the First Alert Explosive Gas and Carbon Monoxide Detector, choose a spot that is near the potential source of gas. For example, an outlet near a gas stove can provide you with monitoring in the kitchen (follow manufacturer guidelines for specific distance recommendations). You should avoid placing a gas detector in close proximity to sources of incoming ventilation, such as a window or air duct, since this can affect the unit's ability to accurately measure the presence of gas in the air inside of the room.