Etching is the key to the decorative pattern of metal plate pattern. In order to get the stripe with clear stripes and strong decoration, it is necessary to control the conditions of the etching process. It is mainly the temperature and etching time of the etching solution.

The filter is a netting made of chemical fibre material in the fan. If the blockage of the filter network is serious, the air supply volume of the fan coil unit will be greatly reduced, thus reducing the refrigerating heat of the room and affecting the air quality quality of the room. Under normal c