A continues flow of highly filtered ‘bacteria free’ air is recalculated using Air handling unit under positive pressure into the operating area by ceiling suspended laminar air flow. Maintaining the temperature and humidity as per requirement of client and decrease the bacteria growth, as fastest death of bacteria occurs at 45 – 50% RH. Field and air contaminant generated during surgery are removed from the area using return air riser with anti-bacterial paint applied on seamless wall panel or wall, which has durability up to 8 – 10 years depending upon use.