Fire resistant doors he shutters shall comprise of two non-combustible boards 12 mm thick sandwiching 30 mm thick fire resistant insulation filler, with 4 mm thick (nominal) commercial ply on both the sides & 3 mm thick sheet rubber interlayer and hardwood lipping all-round with heat activated Intumescent fire seal strips of size 10 x 4 mm on all the sides.
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Budh Vihar, Delhi