| CPC A62C 2/065 (2013.01) | 18 Claims |
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1. A ventilating firestop, comprising a self-supporting wire mesh equipped with an intumescent, wherein
the wire mesh is malleable and is formed into a completely or partially confined volume, wherein said wire mesh is a flame-stopping mesh with a mesh size that provides quenching gap, and
the wire mesh comprises first and second intumescent forming a pattern of stripes of intumescent with spacing and ventilating openings between the stripes,
wherein the pattern of stripes of the first intumescent has a finer mesh size than the pattern of stripes of the second intumescent,
said first intumescent is located on a fire influenceable plane of the wire mesh and has a rapidly expandable pattern of stripes of intumescent which, during a fire attack phase, expands towards each other to close said ventilating openings and form a fire-insulating shield, and
said second intumescent is located on the wire mesh separate from the first intumescent, and has a pattern of stripes expandable slower than the stripes of the stripe pattern of first intumescent which, after formation of the fire-insulating shield, is expandable to subsequently fill up a remaining volume of the firestop.
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