Doors, particularly the maindoor plays the biggest role in feng shui. The first thing to be considered before applying any formula feng shui is to ensure that a door itself has good feng shui. That means, it has to be in tip top condition, always looking fresh and vibrantly energetic, with the knobs and lock set working perfectly fine. Only then, will we start to look at its vicinity and surrounding factors. Feng shui practitioners consider that curtains and door banners can play a very significant role in enhancing the feng shui of doors.