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3M Interam 24.5" x 20' E5A4

Brand: 3M Mfg#: 98040054656
Product#: 479E5A4
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A thin one-part composite system designed to firestop blank openings and larger penetrations such as cable trays and conduit and HVAC ductwork through rated construction


  • Cut and form to desired shape
  • Thermally conductive allows unwanted heat build up to escape
  • Intumesces (expands with heat) to form a hard char that tightly seals penetrations against flame spread, smoke and toxic gases
  • Firestop tested for up to 4 hr in accordance with ASTM E 814 (UL 1479)
  • Easy to install using common trade tools
  • Non-flame supporting
  • Re-enterable for new or retrofit installations


  • Brand: 3M
  • Product Line: Interam
  • Standards: ASTM Specified
  • Material: Aluminum
  • Length: 20 ft
  • Width: 20 in