You might face an instance where due to persistent wind pressure airflow prevents a door from closing completely. This could also be because of the loosening of a spring mechanism. It can lead to a lag in swing speed, in degrees of the closure of a doorway and prevent a room from being airtight when you need it to be.
Different adjustment controls
Most doors in modern homes or commercial buildings are fitted with a hydraulic door closer. These come with adjustment controls for swing speed; that determines how fast a door would close from being fully open; there are also control factors for latching speed; this controls the speed at which the door covers the few inches that determine complete closure. Back-check is another adjustment control which is the resistance that a door gives when it is closing and one tries to open the same. All these factors are determined by different valves for hydraulic control. The configuration might be different in varied door closers; in most cases, there are delayed action closers which help to hold open a door for a longer time period. This helps people with disabilities to come in even when a door is about to close. Visit this link https://doorclosers.com.au/pages/hydraulic-gate-closers for more info on hydraulic door closer.
Adjustments in spring tension
The above aspect helps control the size of a sliding door closer. Its size is determined as per the door width. When closers are sized properly, it is as per the spring tension that is required for a door of a certain width. Some door closers are designed with non-size springs; that indicates that you can adjust the spring tension as per the door size.Adjustments are required in spring tensions that help to solve problems. If there is positive air pressure that prevents a door from closing completely, the spring can be made together; this makes it harder to keep the door open. In order to make adjustments, one needs a step ladder that will help one reach the door closer. On examining the closer, if there are no adjustment screws visible, one would need to look under the cover; this could be held by fasteners or could be simply pulled off. If there is oil on the closer or inside the body, it is time to replace the door closer.
If you turn the adjustment screws clockwise, about 1/8th of a turn, it will help slow down the door closer; you can turn it counter-clockwise which will help speed up the closing time. It is best to get down from the ladder, observe the effects of the same and then do turns accordingly.