We provide a simple checklist of building preparation. This needs to go to site. The preparation would ideally be undertaken by the contractor n advance of the test body arriving on site to maximise the testing time in a day.

For dwellings it may also be necessary to agree the test programme with the building inspector before arriving on site.

Where possible, it is helpful to accurately calculate the envelope area and confirm the fan installation arrangements based on architectural drawings before coming to site.

• The building should be ‘completed’
• All external doors and windows closed
• All internal doors wedged open
• All fire dampers, ventilation louvres and trickle vents closed but not sealed
• Mechanical ventilation turned off with inlet/outlet grilles sealed
• All combustion appliances switched off
• Drainage traps must contain water

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