Envirograf® intumescent ventilation grilles are specially designed for 100mm, 150mm, 200mm, and 300mm plastic or metal ducting apertures. They can be wired into a 24V fire alarm system, to close the grille’s shutter when the power is turned off. Alternatively, a 240V to 24V transformer can be supplied, for wiring into a smoke detector system. If a 24V system is not available, a memory spring closure option is available, which is activated when the shutter temperature reaches 90°C.
Regulations often require fire and smoke protection grilles for openings in walls, ceilings, fire doors or at the entry point of ventilation ducting. The Envirograf® TJ Grille fulfils this requirement, offering full fire and smoke protection.