Best way to test a door before opening it is with the back of your hand, if it's hot you will feel it and instinctively pull away. DO NOT touch the door handle! Least not until you,have ascertained the temp inside the compartment. After that if you absolutely have to open the door do so from a kneeling on one knee position. If the door opens towards you then kneel behind the door so if it does flash you will be shielded to some extent by the door. If it opens away from you open it for a few seconds and have a quick squint then close it. If there is a developed fire within then forget about it and if possible retreat to a safe distance.