The filter in grid form with electrostatic attribute, has applications in air conditioning unites and especially in spit unites and fan coils in order to restrain the greatest amount of dust and prevent it to reach the coil of the machine. The filter’s grid is designed to restrain a variety of dust sizes. It is imported in rolls and as a result we are able to cut it according to the ordered sizes. The particular filter can be compared with other filters having the same characteristics concerning its price and efficiency.