Natural vs mechanical ventilation

Hi Dina, Where is your project located? Projects in Europe may use Arbeitsstaettenrichtlinie ASR 5 as a local equivalent to ASHRAE Standard 62.1-2010, natural ventilation procedure.

According to your description it's hard to make an overall picture of the situation.  If warehouse has an one volume, that is somehow contigious and wide, that allows to flow air relativly free, and such machinery exhaust fans or located in one side of the building, or located +/- equally distributed at the warehouse area and are possible to make stable flow of air from fresh air louvers (maybe even exhaust air louvers - I don't know how they located) providing negative pressure zones so, that it looks feasable, that it can make sufficient air exchande in te warehouse volume, providing fresh air to work places - yes, it can be considered as a zoned mixed-mode system.   If such machinery exhaust fans are located at separate volume of warehouse, that restricts free air flow (for instance - machinery that prodduce heat is located at separate zone, that has some partitions "cutting" it from the rest of warehouse) - it would not be considered as a zoned mixed-mode system to the whole warehouse.    I don't know if budget of the project can make it, but in such cases we advise to make CFD modelling.