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“Firestop Intumescent Fire Seals 2.1m appears to refer to a product designed to provide fire protection by sealing gaps around doors or other openings in buildings.

Intumescent materials are substances that expand when exposed to heat, forming a barrier to prevent the passage of flames, smoke, and hot gases during a fire.

These seals are commonly used in fire doors and other fire-rated assemblies to help maintain the fire resistance of the structure.