The objective is to measure the volume of conditioned air escaping through the building envelope via uncontrolled ventilation at an induced pressure difference of 50Pa.

The following basic steps are typical:

1. Check site preparation / Prepare site – including temporary sealing
2. Calculate the envelope area if not done previously
3. Explain the process to relevant staff and sub-contractors working on or near the building
4. Take environmental condition measurements – wind speed, temperatures, barometric pressures
5. Install template(s) into suitable aperture(s)
6. Install fan(s) into template(s)
7. Connect monitoring equipment
8. Check the static pressure
9. Take multiple pressure difference readings and record fan flow rate(s) – allowing sufficient time for the pressure readings to stabilise
10. Check the static pressure
11. Check site preparation / Prepare site – including temporary sealing
12. Take environmental condition measurements – wind speed, temperatures
13. Process the readings through appropriate software – check that readings fulfil the requirements of the standard
14. If the building fails, attempt to identify/quantify air leakage/infiltration paths
15. Disconnect measurement equipment
16. Remove the fan(s)

17. Remove the template(s)

Back to FAQ list