How deep does a nib or pillar need to be for it to become a preferred installation position?

The nib should have a minimum depth of 450mm to prevent the head of future obstructions.

Visibility extends radially from each mist head and ends wherever there is an obstruction. The default radius is 90 degrees, to mitigate the potential of obstructions either side of the spray head. Annual commissioning includes a verification that the system is not being obstructed inadvertently. Customers are made aware of the need not to block the view of the spray head through a warning, engraved on the face plate. When the spray head is located in a preferred position the coverage pattern can be increased by 45 degrees on the affected side because the location mitigates the introduction of obstructions.

See the Layout Tool for more details.