£106.04 (incl VAT)
Envirograf Intumescent Ventilation Grilles for Doors and Walls providing up to 1 hour protection
A flat plate intumescent grille for doors or walls providing up to 73 minutes of fire protection.
There is a choice of either a plain slot type for more ventilation or a louvered slot that reduces viewing.
They can be fitted one one side or both sides of a door or wall opening.
Ordering sizes are based on the opening size, (height x width)
Overall size is 50mm larger on each dimension
Tested to BS476 Parts 20 and 22 (1987), achieving 66 minutes on one side only; and BS476 Part 22 (1987), achieving an integrity of 73 minutes.
Also tested to EN1363-1 (2000).
£69.49 (incl VAT)
About Intumescent Grilles for Doors and Walls
The Envirograf Intumescent Ventilation Grille consists of an inner and outer plate typically fitted to the risk side of the door or wall.
It is able to provide fire protection for many ventilation openings including:
- Ceilings
- Fire rated doors
- Walls
- 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.
Ventilation
The plain slotted grille provides 6cm free ventilation area per slot.
The louvred slot grille provides 3.2cm free ventilation area per slot.
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