1. Normally closed fireproof glass window: in addition to the required fireproof performance, the normally closed fireproof glass window is also required to have the functions of active closure and sequential closure. During the installation of fire-proof glass windows, the verticality of the front, rear, left and right shall be corrected with a level ruler or a hanging line method, so as to be horizontal, vertical and the same height. These supporting functions can not be ignored, otherwise many hidden dangers will be left. At present, most fireproof glass windows are used in China, mainly because the parts used are simple mechanical products, simple manufacturing equipment and low cost. However, the normally closed fireproof glass window has many defects:

(1) the fire-proof glass windows shall be scattered in the walkways, stairs and lobby, and the fire-proof glass windows shall be closed frequently, which will bring unnecessary trouble to the normal passage. In order to facilitate access, many places are open.

(2) because this place is usually a place where people often walk around, with heavy traffic and doors often open, the fireproof glass window and its hardware will inevitably be often damaged, especially the door closer. Once the viewpoint when the device is turned on is larger than the observation range, the function of active shutdown cannot be performed.

(3) when the engineering inspection is put into use, the door closer is usually debugged to close the door. However, in case of fire, the impact force of hot air expansion will produce a certain pressure difference on both sides of the fireproof glass window. Adjusting the door closer makes it difficult to fix the fireproof glass window In this way, fireworks will enter the public lobby, firefighters cannot enter the lobby to save people, and it will become impossible to escape with closed stairs.

2. Normally open fireproof glass windows: in the specification, normally open fireproof glass windows use three "should" words continuously, and strictly emphasize the addition of signal response function on the basis of normally closed fireproof glass windows. In addition, one of these three basic skills is required. At present, most of the fireproof glass windows on the market have the functions of "self sealing" and "signal response", and have short and reliable functions, which has been confirmed by many fire cases. Because the fireproof glass window cannot be closed, the fire spreading at the scene cannot be isolated.

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