The Envirograf Intumescent Grille consists of an inner and outer plate typically fitted to the risk side of the door or wall.
It is able to provides fire and smoke protection for many ventilation openings including:
- Fire rated doors
- Entry points for ventilation ducting
- Fan covers
The inner and outer plate houses the intumescent material that in a fire, would seal up the slot in 40 under seconds and provide one hour fire protection.
It is suitable for internal and external fitting, including ceilings.
An insect and fly screen mesh can be supplied for fixing behind the grille face for sterile work areas.
Where the risk side of the opening is identified as being both sides ( such as a corridor or the top of a staircase) grilles would be fitted to both sides.
The plain slotted grille provides 6cm free ventilation area per slot
The louvred slot grille provides 3.2cm free ventilation area per slot