THE installation of carbon monoxide detectors in Ireland is not mandatory because there is a lack of Europe-wide regulations to safeguard the integrity of individual alarms. However, their use can be invaluable in alerting occupants to the dangers of CO leaks. There are many models of alarms on the market, although not all are reliable. Those who are intending to buy CO detectors should always check they are in compliance with the European Standard EN 50291.