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Fire-protective cellular service ducting

  • US 4,093,818 A
  • Filed: 08/13/1976
  • Issued: 06/06/1978
  • Est. Priority Date: 12/20/1974
  • Status: Expired due to Term
First Claim
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1. An assembly, for accommodating service lines, which comprises a length of ducting, a pair of metal frames each having a peripheral fit with the interior of the ducting, said frames being spaced apart in the length direction of the ducting to define a thermal conduction restricting gap between the frames, a block of structural cellular material so shaped, dimensioned and positioned as to have ends which engage within the frames and to extend from within one frame and across the position of the gap to within the other frame, said material having cell walls which define cells extending in the length direction of the ducting and permitting service lines to be passed through the block in said direction, and an intumescent material coated on said walls and being expandable to close said cells under fire conditions.

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