Step-by-Step Guide: How to Carry Out a VAC Test (European Vacuum Test)
The European Vacuum Test (EVT) is a recognised method used to assess dust contamination levels within ventilation systems and other surfaces. It is commonly used during post-clean verification to confirm cleanliness standards have been achieved.
In this guide, we’ll explain what a VAC test is, when it should be carried out, the equipment required and the correct sampling procedure.
What Is a European Vacuum Test (EVT) or VAC test?
The European Vacuum Test (EVT) is a recognised dust sampling method used to verify the cleanliness of ventilation systems after cleaning. It provides measurable, laboratory-tested evidence of dust contamination by collecting particles from a defined surface area using specialist equipment.
Results are reported in grams per square metre (g/m²), helping building owners and facilities managers demonstrate that ventilation hygiene standards have been achieved.
Best Practice
A visual inspection alone cannot accurately measure dust contamination within a ventilation system. Using recognised methods such as the European Vacuum Test (EVT) provides objective, laboratory-verified evidence that cleanliness standards have been achieved.
When Is a VAC Test Used?
A VAC test is commonly carried out:
- Following ventilation duct cleaning
- During post-clean verification
- As part of indoor air quality investigations
- During planned ventilation hygiene inspections
- To provide documented evidence of cleanliness
For organisations responsible for maintaining ventilation systems, the results provide objective evidence that cleaning work has been completed to an acceptable standard.
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