FIELD: fire-prevention equipment.
SUBSTANCE: invention relates to a fire cuff for sealing openings passing through walls (11) or ceilings, in particular, conducting pipelines (12). Fire cuff (10) has frame (16) and unit (20) located in it and, if necessary, of intumescent material. Intumescent insert (22) is arranged between block (20) and frame (16). Intumescent insert (22) and block (20) are made of different intumescent materials with different properties as regards to activation temperature and swelling behavior.
EFFECT: characteristics are adapted so that stability of fire-induced crust of intumescent unit (20) is improved.
14 cl, 2 dwg
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