AS4775-2007 Section 6.2 specifies exact dimensional requirements to ensure full-body coverage. These are mandatory - an installation outside these tolerances is non-compliant even if the unit itself is AS4775-certified.
| Requirement | Specification |
|---|---|
| Shower head height (bottom of head) | Minimum 2,083mm — Maximum 2,438mm above standing surface |
| Spray pattern diameter | Minimum 508mm at 1,524mm above standing surface |
| Centre of spray pattern clearance | Minimum 406mm from any obstruction |
| Eyewash nozzle height | 838mm minimum — 1,143mm maximum from standing surface |
| Eyewash nozzle wall clearance | Minimum 153mm from any wall or obstruction |
These dimensions ensure that a worker of average height stands fully within the spray pattern and receives adequate coverage across the shoulders and upper body during a flush.