Pakua with devil face in center isused to get rid of malefic impact of evil eye & ward off wrong vibrations entering a building mostly through the main door. Therefore it is used extensively in restaurants and shops etc. The bigger the pakua, better it is. When this mirror is hung North, the business prospers. Hanging it in East gives progress and fame. It should never be kept in South. Fixing Pakua mirror in front or back door stops entry of negative energy. It does not allow the positive energy to go out from place of its use.