Dear All,

In what relates to flush-out option, the guide specifies that 4 267 140 liters of outdoor air per square meter of gross floor area (GFA) should be supplied.

My question is the following: the area to be considered in the calculation of flush-out outdoor air volumes refers to occupiable spaces GFA only, or to the total project GFA (which includes non-occupiable spaces)?

In our opinion, taking into account the intent of this credit (“To promote occupants’ comfort, well-being, and productivity by improving indoor air quality”), we should be able to exclude some portions of the project GFA which is not occupiable or where occupation is not expected. Specifically:

  1. Elevator shafts;
  2. Interior partitions (we are currently working on a hospitality project where interior partitions have a significant area);
  3. Emergency staircases;
  4. Technical zones not meant to be occupied (pumping stations, electric switchboards, etc);

Can anyone validate our approach?

Thanks in advance