Ventilation – Horizontal distance for air intakes and exhausts

In the BREEAM International NC 2016 scheme, the distance required between the building’s air intakes and exhausts is a two-dimensional horizontal distance, and not a three-dimensional distance, regardless of whether EN13779 is used to demonstrate compliance.

The design team must either

• design in accordance with EN 13779, which allows horizontal distances of less than 10m in certain circumstances

or

• ensure the horizontal distance is more than 10m, where EN13779 is not being used