Door closer China Manufacturer
Door closer manufacturer China factory for glass door[DC-004,005,006]
The use requirements and selection of door closers
Door closer products must meet the national standard GB2698-2005, fire door closer  should also meet the requirements of GA93-1995 “Door closer test for fire doors”. 
The factors that should be considered when choosing a door closer are: the width of the door, the frequency of opening the door, the use requirements and the use environment, etc. The width of the door is the most important factor in choosing the door closer model. Common doors include fire doors, wooden doors, aluminum alloy doors, glass doors, and steel doors. Usually the weight of the door is small, so choose the model with less power, and vice versa. The door opening frequency is a factor closely related to product quality. For frequent use occasions, the product should be required to have good sealing performance and long life.