There must be a lot of dust falling on the side of the door of the fire door closer. If it is a long time, it will form very difficult dust, which will make the door closer switch very insensitive, and even form a severe phenomenon that cannot be switched. Problems, so it is very useful to use regular cleansing and cleaning, use clean towels and water, use neutral detergent without corrosive effect, remove dust and grease. After cleaning, use clean soft towel without moisture. After the wiping, it is prevented that the residual moisture is deepened to the door closer, and rust is formed or the internal structure is damaged.
Select the manufacturer's special smooth oil. The effect of this smooth oil is to make the internal parts moisturized, and also handle the switch door is not sensitive.