The Panchajanya Shankh is normally found on certain seas coasts and the Kailash Manasarovar. The Panchajanya Shankh has great importance in Vastu Shastra as it is said to free the house from all kinds of Vastu Doshas. It is also believed that the Panchajanya Shankh possesses certain specific paranormal properties, which enable it to balance the circulation of the Pancha Tattva inside the house. The Pancha Tattva or the Five Elements – Fire [Agni], Earth [Prithvi], Jal [Water], Vayu [Air] and Aakash [Sky] are the basic building blocks of the Universe and hence Vastu Shastra considers it extremely importance to have a proper balance of the Five Elements inside a dwelling.
The Panchajanya Shankh is always said to be in a Jagarut or Awakened State and hence the Sthapana or Pranpratishtha of this Shankh in the house can be performed in any manner, which is suitable to the possessor of the Shankh. Vastu Shastra prescribes that the Panchajanya Shankh should be installed in the center of the house near the main door or buried one foot under the floor in an inverted position in the Ishan Kone or the North Eastern Corner of the house and a Havan should be performed in that place. However, burying the Panchajanya Shankh under the floor in not possible for people living in flats and hence they can install it in their homes by performing a simple Panchopachara Puja, those who do not know what is a Panchopachara Puja can consult this post – Here
It is said that blowing the Panchajanya Shankh instills fear and dread in the minds of enemies and opponents and hence it is also considered to be most beneficial in gaining the upper hand in litigation, disputes and all legal and court related matters. Installing the Panchajanya Shankh in the house is also said to make the house secure from harmful unseen mystical entities and the blowing of the Shankh will make them leave the house and its surroundings.