supply and works of ventilation and ds system balance supply and works for ventilation and ds system , design, manufacture, testing at shop, delivery at site all balance components required for completion of following system and complete erection of commissioning, system integration, pg test & handing over of following system as per technical specification ( minimum list of items are covered in annexure-a ) part-a supply of balance items , complete pressurized and tunnel ventilation system with electrics and c&i for wagon tippler complex for wt-3&4, conveyor tunnel of 1a1, 1a2, erh and adjacent conveyor tunnel of bcn-6, all chp mccs etc. , complete plain water and dry fog dust suppression system, service water, drinking water, pre-wetting system with electrics and c&i , part-b complete e&c , erection of balance items including items to be supplied as per sl. no 1. & 2. for ventilation, ds, dfds, service water, potable water, prewetting system as required to complete erection of all the system. , commissioning, trial run and performance guarantee test for ventilation, ds, dfds, service water, potable water, prewetting system as required to complete erection of all the system.