Understand the purpose
A controlled visualisation test makes airflow patterns visible. It can help show disturbances or movement at the opening under the conditions being assessed. The method, material and precautions should be selected by the competent tester for the application.
Do not introduce improvised smoke or an ignition source into a cupboard used for hazardous substances. Arrange the assessment through the responsible laboratory and testing team.
Separate the different checks
| Check | What it addresses |
|---|---|
| Airflow visualisation | Observed flow patterns in the assessed arrangement. |
| Face-velocity measurements | Air speed across the defined opening. |
| Containment testing | Performance under a specified test method. |
| Control checks | Operation of the relevant indicators and alarms. |
Our face-velocity guide explains that separate measurement.
Prepare the working arrangement
Tell the tester how the cupboard is used and whether the assessment concerns a new installation, changed setup or reported fault. Identify apparatus, operating sash position and relevant room conditions.
The baffle guide helps identify internal airflow paths. The placement guide highlights nearby room features to discuss.
Keep the result in context
- Record the test method and equipment identification.
- Document the configuration and conditions assessed.
- Keep observations with other required test results.
- Assign any corrective actions and return-to-use decisions.
- Retain the report with the cupboard records.
For ongoing building-compliance requirements, discuss the scope separately through our SS 11 testing page. A visual observation alone is not a complete certification record.