Tender For procurement of various sizes of orifices and inspection doors for hp 803 mills - orifices of various sizes, style 51 (orifice dia : 396 mm), style 52 (orifice dia : 400mm), style 53 (orifice dia : 406mm), style 54 (orifice dia : 410mm), style 55 (orifice dia : 415mm), style 59 (orifice dia : 435mm), inspections doors for hot air ducts, inspection door for hot air duct