INTRODUCTION
There is often a requirement for a
ventilation aperture to be cut into a fire resisting compartment wall or door. This penetration breaches the integrity of the element so it is necessary to fit a suitable fire resistant ventilator unit.
Therm-A-Grille offers a specially designed solution to the problem by providing a light weight intumescent ventilator core with excellent airflow characteristics and rapid activation in the event of a fire.
DESCRIPTION
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 also carries an intumescent edge 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.
PERFORMANCE
The fire performance of Therm-A-Grille has been proved in tests carried out to BS 476 Part 22 1987 where a grille measuring 570 x 570mm obtained an integrity and insulation rating of 66 minutes when mounted in a fire door panel. The free area of the grille is over 50% so the 600 x 600mm size vent has an effective ventilation aperture of 185,000mm2.
AVAILABILITY
Therm-A-Grille is available in stock sizes ranging from 100 x 100mm up to 600 x 600mm, in 50mm steps, in any combination of width and height. It can also be produced to special order in any intermediate size.
COVER PLATES
Optional cover grilles for walls, doors and ends of ducts pressed steel and aluminium options available.
 |
|
INSTALLATION
Therm-A-Grille is fitted as supplied into any vertical aperture and does not require any additional mastic sealant to its perimeter. Fixing should be by 2” No. 8 steel screws at 150mm centres through the mesh forming the flange.
The grille should be fitted centrally within the thickness of the fire resisting element. 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.
Facia or louvre plates may be fitted to the substrate surface.
STANDARD SIZES AVAILABLE
100X100X38MM
150X150X38MM
200X200X38MM
200X150X38MM
225X75X38MM
250X250X38MM
300X150X38MM
300X300X38MM
350X350X38MM
400X400X38MM
500X500X38MM
600X600X38MM
Other sizes available up to a maximum of 600x600x38mm. |
01223 839727 
