bids are invited for provn of central heating system for double storey building complete , pre-painted galvalume sheets of camouflage pattern of size 3200 x 800 x 0.50 mm thickness. , prepainted galvalume sheets of camouflage pattern of size 3000 x 800 x 0.50 mm thickness. , 8 mm j hook with washer nut and bolts as required , purlin of size 40x40x5 mm thickness duly painted with two coats of synthetic enamel paint first quality , prefab mild steel of size 610x1700 mm. outer frame made out of isa 40x40x6 mm and door shutter frame of isa 35x35x5 mm , elect wiring as reqd for smooth functioning of central heating system total quantity : 1056