tender for renovation of auditorium block, utcs complex, vishwas nagar, delhi. (sh: furniture work). , providing and fixing auditorium chair having gravity tip-up seat mechanism (spring-free) with counterweight arrangement, fabricated and installed as per following specifications: structure: stand made of 200 × 75 × 6 mm m.s. flat welded to 38 × 38 × 2 mm crca square tube (22 long) further supported with 38 × 38 × 2 mm crca tube (11 long). tip-up mechanism supported by 200 × 75 × 6 mm m.s. flat with twin m.s. supports of 12 mm dia. seat bracket made of 12 × 25 × 100 mm m.s. flat welded to 80 × 100 × 3 mm plate. back bracket made from 200 × 70 × 70 mm, 1.6 mm thick crca sheet with longitudinal holes. seat & back assembly: seat shell of size 540 × 580 × 2.65 mm made of virgin abs plastic by vacuum forming. seat base of 19 mm thick plywood (440 × 490 mm) with pu foam (density 50 ± 5 kg/m³). back shell of size 540 × 780 × 2.65 mm abs plastic. back made of 15 mm bent plywood with pu foam (size 470 × 730 mm), thickness varying from 90 mm (top) tapering to 120 mm. side panels & armrest: side panels of 12 mm plywood covered with fabric and foam, fully concealing metal parts. armrests of size approx. 425 × 25 × 55/70 mm depending upon centre-to-centre spacing, including rotatable/retractable wooden writing tablet. foam & fabric: pu foam density: seat - 50 ± 5 kg/m³, back - 48 ± 5 kg/m³. upholstery with 100% polyester fabric fused with 3/5/7 mm foam, including quilting wherever required. optional fr-treated fabric conforming to bs en 1021: part-1 (smouldering cigarette test). fasteners: all bolts fixed with cnc milled dash nuts (20 × 10 mm) properly embedded and secured. finish: complete ms components to be powder coated through 7-tank process (degreasing, derusting, activation, phosphating, etc.) using hoist/crane system. complete in all respects including making holes in floor/wall or any other related work etc. as per approved design, drawing and specifications, including fixing in position, as directed by engineer-in-charge (nothing extra will be paid on account of execution of the above item).