What is it?
Ductwork air leakage levels can be measured by ductwork pressure testing. This usually involves temporarily connecting a duct leakage tester in order to pressurise the ductwork, including duct-mounted components. Airflow through the pressurising device creates an internal, uniformed static pressure within the ductwork. The aim of this specific measurement is to relate the pressure differential across the ductwork. This ensures the airflow rate required to produce it.
Appropriate leakage testing should always be carried out under positive pressure. Even when the ductwork is to operate under negative pressure. This is because, if a duct under a negative pressure fails a leakage test, it is impossible to identify the leakage paths.
Generally, the higher the airflow rate required to produce a given pressure difference, the less airtight the ductwork.
Who requires Ductwork Pressure Testing?
The Building Regulations require ductwork leakage testing, leading to implications for designers, installers and maintenance contractors. Air leakage from ducted distribution systems is an important consideration in the design and operation of ventilation systems. A ductwork system that has limited air leakage will ensure, that the design characteristics of the system can be maintained. Therefore keeping energy and operational costs to a minimum.
Ventilation Hygiene Services adhere to pressurisation techniques as described in standard test methods such as; HVCA DW/143.