Unless otherwise stated, the approvals relate to the louvre vent’s resistance to the creation of a hole large enough for a person to pass through, as indicated by the 225 mm by 400 mm elliptical test block defined in LPS 1175.
It is recommended specifiers select louvres rated to resist the creation of smaller holes if the louvres are to be used within the close proximity of equipment that needs to be protected from tampering/removal, or lock operating hardware that does not require a key (e.g. thumbturns, lever handles, push pads or panic bars).
For guidance, the test blocks used are:
|8mm (+3mm/-0mm) by 25mm (+3mm/-0mm) |
|Represents the louvre panel's likely resistance to creation of a hole through which a piece of wire, screwdriver, lever or other such device can be passed. Such an attack may be attempted |
by an intruder wishing to operate a panic bar, emergency lever handle or other non-deadlocked device capable of releasing the boltwork on the item in which the louvre panel is mounted on or an item directly adjacent to that in which the louvre panel is mounted
|Hand hole||60mm (+3mm/-0mm)|
|Represents the louvre panel's likely resistance to creation of a hand hole. Such an attack may be attempted by an intruder wishing to:|
● Operate a thumbturn to release the boltwork on the item in which the louvre panel is mounted or on an item directly adjacent to that in which the louvre panel is mounted
● Retrieve an item from the protected side of the louvre panel e.g. an item on display behind a shop window, a set of door keys or a set of car keys
|Elliptical section of 400mm|
(+3mm/-0mm) major axis
by 225mm (+3mm/-0mm)
|Represents the louvre panel's resistance to creation of a hole through which an elliptical test block measuring 400mm x 25mm may be passed. This replicates the size a person may be able to pass through and reflects the test block defined in LPS 1175:Issue 7|