Double openable acoustic doors of frame made of M.S. sheet 14 SWG (2mm thick) frame clad on both sides with 2 mm thick MS sheets with cavity fill of 75 mm thick resin bonded glass wool of 32 kg/m2 density including nitrile rubber gaskets between MS sheet cladding and frame of MS tube 100x40mm of 14 SWG, self lubricating double openable door mechanism and heavy duty hardware / locking mechanism