Dear all,

I have an office room located inside a gymnasium space. The gymnasium is conditioned by an AHU, while the office room has an FCU.

For the office room, fresh air is not provided separately through a dedicated fresh air duct. Instead, the exhaust rate in the office is higher than the supply, causing a negative pressure in the office, and consequently air will flow from the ventilated gymnasium towards the office through infiltration/cracks.

If this infiltrated air is proven to include the minimum amount of fresh air required for the office space, is this scenario acceptable, or a separate fresh air duct is required in this case? Please note that I have around 16 cases similar to this one!

Many thanks!