Therm-A-Grille consists of two sheets of steel mesh that have been coated with a graphite based intumescent material. The coating thickness has been optimized to ensure rapid activation whilst maintaining a high free area and good air flow rate.
The sheets are folded to form a box section which gives the assembly high strength and rigidity, provides a flange for fixing and carries an intumescent egde seal. There is very little heat transfer between the two grille plates to ensure good insulation. Therm-A-Grilles are 38mm thick for fitting to any 30 minute or 60 minute fire door.
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