What factors should be considered when choosing a door closer?

Different door leaves have different requirements for door closers, therefore, the correct choice also has a great influence on the use. You can refer to the following aspects.

1. Door leaf width
Steel fire doors use the hinge as the axis to drive the door to open and close. The wider the door, the greater the distance between the center of gravity and the hinge axis, and the greater the torque required to control the rotation of the door. Therefore, the width of the door is the door closer. The primary element of power level selection.
If you choose a door closer with too small force level, the closing torque of the door closer will not be enough and the door cannot be completely closed; if you choose a door closer with too large force level, although the closing torque is sufficient, it will bring the required door opening at the same time. The problem of excessive force.

2. Leaf quality
The quality of the door leaf of the steel fire door is an important factor in the selection of the force level of the door closer. In theory, all the weight of the door leaf is borne by the hinge, and the door closer itself does not bear the weight. However, in actual use, after the hinge bears the weight of the door leaf, it will produce elastic deformation, which will cause the door leaf to sag and increase the rolling friction force, which will affect the use of the door closer.

3. The wind/air pressure of the operating environment
In some special applications, such as pressurized or sealed rooms, or where natural ventilation is better, there are varying degrees of wind/air pressure. The wind/air pressure will act on the door leaf surface of the steel fire door, preventing the door leaf from closing, and adding force to the closing of the door closer. Therefore, when used in the above-mentioned occasions, it is necessary to add 1-2 force level selections according to the actual situation.