The Hasman Laboratory can independently test your microbiological samples and European Vacuum Tests (formerly Preferred Vacuum Tests) in our safe laboratory by our experienced lab technicians. Our technicians have over 30 years of experience in testing and analysing data to ensure your samples are correctly analysed and reported.
Microbiological tests involve ductwork swab testing, where swabs are used to check for bacteria and mould, indicating the growth of harmful microorganisms within ventilation systems. This test is extremely important in several different ventilation systems, including food production, hospitals, care homes, schools, universities, and any building with a ventilation system. Data can be used to show your clients exactly what is happening within their ductwork and the best course of action to tackle any spread or growth.
Samples are easy to take; by using the swab on the inside of the ductwork, the test collects surface growth, and when sent back to our laboratory, the swab can be properly assessed by allowing the cultures to grow, and our laboratory technicians can identify potential problems.
The European Vacuum Test (EVT) method is advised in BS15780, as well as TR19, as the most suitable method for post-clean verification of HVAC systems.
A capsule is connected to a previously calibrated vacuum test pump. The sample is collected by vacuuming a 10x10cm area of the ductwork’s internal surface. The information about each test must be recorded on a test sheet detailing location, ductwork class (low, medium or high), system type (supply, extract or recirculation) and if the sample has been collected pre or post-cleaning. Our laboratory technicians weigh the dust deposits within the capsule to determine the overall ductwork cleanliness per m2.
The vacuum test pump carries out EVT (PVT) sampling to measure surface deposits of dust within the ductwork and is the most suitable method for post-cleaning verification for all HVAC systems and ductwork.
The filter in each capsule is pre-weighed, and each capsule has a unique ID issued by our laboratory.
