Preferred Vacuum Testing

Preferred Vacuum Test for Ductwork Cleanliness Inspection

Preferred Vacuum Testing is the preferred method of stating whether ventilation ductwork is clean or dirty. Preferred vacuum testing entails vacuuming out a 10cm squared grid 3 times over a 50metre stretch of ductwork. These samples are vacuumed directly into cassettes that are sent to an independent laboratory to be weighed.