Therm-A-Grille - Intumescent air transfer grille
Verified by manufacturer 11 days ago
Intumescent grilles.
Application
Suitable for vertical apertures in fire resisting doors and compartment walls.
Description
An intumescent air transfer grille/ vent consisting of two sheets of steel mesh coated with a graphite based intumescent material, all retained in a lightweight frame.
Providing free air flow through the unit over approximately 50% of the face area. The intumescent coating activates at approximately 180°C and expands to fill the ventilation holes in the grille thus providing the required fire resistance.
The twin plate construction provides fire insulation performance in addition to fire integrity.
It is held in position by means of 50 mm No.8 size steel screws (not supplied) through the unit’s frame at 150 mm centres. Fitted centrally within the aperture.
Where the wall includes a cavity e.g, plasterboard/timber stud partitions then the aperture must be lined with fire resisting material e.g. a steel sleeve to the full depth of the aperture.
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 either side of the aperture.
General information
Color | Black |
Material | Graphite Steel |
Shape | Square Rectangle |
Length | 50 mm 100 mm 150 mm 200 mm 250 mm |
Width | 50 mm 100 mm 150 mm 200 mm 250 mm |
Height | 38 mm Manufacturer guidanceThickness |
Uniclass | |
CAWS | P21/896 Door mounted fire resisting air transfer grilles P21/66 Door mounted air transfer grilles |
Specification data - Fire-resisting air transfer grilles
Standard | To BS 476-20. |
Size | 50 x 50 mm.100 x 100 mm.150 x 150 mm.200 x 200 mm.250 x 250 mm.300 x 300 mm.350 x 350 mm.400 x 400 mm.450 x 450 mm.500 x 500 mm.550 x 500 mm.600 x 600 mm. |
Fire resistance | 60 minutes. |
Material and finish | Steel and graphite. |
Colour | Black. |
Accessories | Facia. Louvre plate. |
Literature
ISL Therm-A-Grille Application Guide
ISL Therm-A-Grille Technical Data Sheet