Power plant air filter protects the facilities and is used to prevent the power plant facilities from being damaged by dust or other contamination particles. Introduction of Nano-technology to filter industry is the most recent evolution in this field. Using this method cellulose or synthetic textiles (usually with a diameter of 10 – 30 microns) are coated with a layer of Nano-textiles (with a diameter of 50 – 400 nm).There are two different methods for separating particles in filter paper structure:In-depth filtration, in which particles are separated in different paper layers according to their size.Surface filtration, in which all particles are separated in the paper surface.In Behran Co. filter paper is coated with Polyamide textiles with a diameter of less than 100 nm using electrospinning process.