When will the civil air defense door leaf enter the site for installation?

2 days in advance. According to the technical disclosure of civil air defense door installation of Beijing Duyu Equipment Installation Engineering Co., Ltd. on October 21, 22, the installation time of the second civil air defense door requires that the general contractor (on-site civil construction party) should inform the civil air defense manufacturer to enter the site to install the civil air defense door frame two days in advance. Civil air defense doors are the doors at the entrances and exits of civil protection projects. The classification of civil air defense doors is quite distinct, including ordinary single and double doors for protecting sealed door and sealed door, and single and double doors for protecting sealed door and sealed door.