火区封闭顺序的正确与否,直接影响到火区内的风压、风速、风量和瓦斯浓度的变化,如果封闭顺序不正确,甚至会造成火区内瓦斯爆炸。所以,能否正确的选择封闭顺序,对救护队的人身安全和最大限度地减少火灾所造成的危害将起到决定性的作用。在火区封闭顺序上有三种方法:一是先封闭入风侧后封闭回风侧(简称“先入后回”);二是入风回风同时封闭(简称“入回 Whether the sealing sequence of the fire zone is correct or not will directly affect the change of wind pressure, wind speed, air volume and gas concentration in the fire zone. If the sealing sequence is not correct, it may even cause gas explosion in the fire zone. Therefore, the correct selection of the order of closure will play a decisive role in ensuring the personal safety of the ambulance team and minimizing the harm caused by the fire. There are three ways to close the order of the fire area: one is to close the return air side first after entering the wind side (referred to as “back first”); the other is to close the air inlet and return air simultaneously