Help to model a natural ventilation system with non-eletric fans to exhaustion.

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Hello my friends!

I'm really new on energy modeling, I'm trying to model a big bulk storage warehouse (Area= 46,000m², 1 floor) at São Paulo, Brazil, using Sketch-Up to Open Studio to EnergyPlus.

My difficult is on how to model the natural ventilation system composed by the infiltration between a metal grille on side walls, and the exhaustion by non-eletric fans at the roof.

I created just a big thermal zone, but I don't know if this is going to be well acuratted cause the big size of my warehouse.

I already search on oldest posts here but I didn't find the exhaustion by non-eletric fans.

Thank you all!