supply of supply of and fitments of items as per schedule of requirements , cost of supply and fitment of hardwon 7/8 copper pipe with elbow, socket and copper leak-p roof brazing. hsn code-74111000. ] , cost of supply and fitment of hardwon 5/8 copper pipe with elbow, socket and copper leak-p roof brazing. hsn code-74111000. ] , cost of supply and fitment of thermal insulation sheet covering on roof inside the ceiling and covering externally insulated folse celling of 2/2 feet outside the air conditioner unit room. room size 14x1 8=252 sq.ft. hsn code- 85469090. ] , supply and fitment of fabricated iron structure for covering of duct and cover with plywood s heet and shifting of wall paper sheet on plywood. having size 25x11=275 sq.ft. hsn code- 73089090. ]