Door viewers are typically used on hotel, motel and apartment entrance doors to permit individuals to see the person on the other side of the door without having to open the door. Conference and meeting rooms frequently have door viewers that allow service people to peek inside the room without inte

The door scheduling is suitable to the design which is belong to designer. The designers must have concept of design, and then find the door hardwares which meet the design's requirement of designers.1.FactorsThe location of doorThe functions of inter door and outer doorThe situations of safetyThe s