The intumescent downlighter cover is needed because downlighters in ceilings are widely used in commercial buildings and each ceiling is subject to fire regulations. Therefore, where applicable, the ceiling construction needs to be fire rated. However, once a hole has been made in the ceiling for a downlighter, the integrity of the construction and it's ability to perform in a fire can be reduced significantly. Installed in seconds, there's no screws or drilling required.
To combat this, the downlighter cover has been developed to give protection for holes created by the installation of a downlighter and to allow for maximum ease of fitting. Fire rated to BS EN 1365-2:2000 and BS476 Part 23: 1987, providing 30 or 60 minute protection (to match the rating of the ceiling). Ventilated to reduce heat build up too, the downlighter is acoustic rated too.
In a fire situation the cover expands internally to fill all the available space with a highly insulating fire resistant char. Thus, the fire is unable to penetrate the hole and the cover is able to give additional insulation protection to the ceiling void to reduce the chance of heat build up and ignition of flammable materials such as accumulated dust and insulation.