In fact, it should be said that a door closer is a mechanism that is usually placed at the top of the door to close it and prevents the door from being tightly closed and slammed. A door closer is a hydraulic device that, if installed in the right place and properly adjusted, prevents excessive noise when opening and closing the door. It can also ensure that the door is closed. One of the differences of HTN Prime dampers is the use of fire-resistant hydraulic oil. Although this feature is not tangible, it is very important during a fire accident. Because fire-resistant oils are not flammable during a fire and prevent the fire from spreading. Our company’s dampers are one of the most accurate models on the market, which have high strength and resistance. These products have a 5-year warranty and after a long time, they will perform the same as the first days of use. Also, the weight of the door is very important for using the damper.