For some special use occasions, such as a sealed space or a pressurized room, there are some places where the ventilation effect is better and the wind is relatively high. These places need to consider the wind and air pressure used in the current environment. These differences in wind and air pressure will act on the door and hinder the closing of the fire door, which will add an extra burden to the closing of the door closer. Therefore, when installing door closers in places where the wind and air conditions mentioned above are different from the normal indoor environment, you should add 1-2 force levels to the selection according to the actual situation.
