Envirograf intumescent fire prevention ventilation grille consisting of an inner and outer plate having a total thickness of 5mm. These Passive Fire plates house the intumescent material which, in a fire, would seal up the slots or louvres in under 40 seconds, giving up to 73 minutes of fire protection.
– Utilised either side of a ventilation opening in fire rated doors and walls, providing up to 73 minutes integrity- Available in two forms to suit situations where only one or both sides of the wall or door are at risk
The sets are defined in two ways: the /D version is for use in situations in which the risk is double-sided (that is, the opening could be attacked by fire from either side); and the /S version is for use in situations in which it has been clearly identified that only a single side of the opening is at risk. When fitting the /S version, the intumesced plate is placed on the risk side and the plain plate is placed on the opposite side of the opening. Order the grilles to suit the opening to be protected – the external measurement of the grille needs to be at least 50mm larger than the opening to allow for fixing. Special sizes can be produced (prices quoted on request). See price list for full range of available sizes.
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).