![]() The intumescent fire grille is held in position by means of 50mm No.8 size steel screws (not supplied) through the unit‚Äôs frame at 150mm centres. Therm-A-Grilles provide a flange for fixing and are 38mm thick to fit to any 30 minute or 60 minute fire door. Apertures in fire resisting door leaves should only be formed by suitably qualified door converters to ensure that the fire integrity of the door is not compromised. Facia or louvre plates (not supplied as standard) may be fitted to the substrate surface. ![]() For stud and plaster walls or any element where a void is present, a steel sleeve should be provided to line the full depth of the aperture to it’s perimeter. The grille should be fitted centrally within the thickness of the fire resisting element. 8 steel screws at 150mm centres through the mesh forming the flange. The intumescent air transfer grille does not require any additional mastic sealant to its perimeter and fixing should be by 2″” No. The twin plate construction provides fire insulation performance in addition to fire integrity and the coating thickness has been optimized to ensure rapid activation, whilst maintaining a high free area and a good air flow rate of over 50% of the face area to create the ideal intumescent air transfer grille. If you are looking for an intumescent grille, Therm-A-Grille offers a specially designed solution that provides a light weight intumescent ventilator core with excellent airflow characteristics and rapid activation in the event of a fire.Ĭonsisting of two sheets, the intumescent grille has been made from steel mesh that has been coated with a graphite based intumescent material, which activates at approximately 180¬∞C and expands to fill the ventilation holes in the grille thus providing the required fire resistance. Therm-A-Grille provides a suitable solution for this, as applications could include vertical apertures in fire resisting doors, compartment walls. There is often a requirement for a ventilation aperture to be cut into a fire resisting compartment wall or door, as a penetration within the wall or door breaches the integrity so it is necessary to fit a suitable fire resistant intumescent ventilator unit.
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