Touching the door handle is to know whether the other end of the door is on fire or whether the temperature is already high. You can't take the elevator, because the elevator shaft is a vertical passage, and stack effect will happen. Moreover, fires are likely to cause power outages and be trapped. Once trapped and smoke forms along the elevator shaft, it is difficult for stack effect personnel to escape, and it is easy to suffocate or burn. Due to the rising of hot air, there will be a lot of smoke floating from the upper floor, so there should be air below 30 cm from the ground in the fire. Therefore, try to crawl low in the smoke, try to keep your head close to the ground, and ensure that your breathing will not suffocate.