If a blower door test shows a reading above BAS, what is the required action?

When a blower door test indicates a reading above the Building Air Leakage Standard (BAS), this typically suggests that the building is leaking air at a higher rate than recommended standards. In this scenario, the appropriate action is to not require additional ventilation because the existing air leakage may already be allowing an adequate exchange of air.

Ventilation systems are designed to bring in outside air to maintain indoor air quality, but if a building is leaky, it effectively allows for air to flow in and out more freely than desired. Therefore, imposing further ventilation could lead to energy inefficiencies or unwanted drafts. It's crucial to assess the overall air quality and energy efficiency of the space, but in relation to the blower door test reading, the established standard indicates that additional ventilation is unnecessary at that moment.

Addressing air quality and energy performance should focus on sealing leaks and improving the building envelope rather than automatically increasing ventilation, which may not always be beneficial.