Hi Everybody

hoping I have posted to the right forum but just looking for a little guidance.

I am installing a Hood and MUA air system for a small restaurant in Sri Lanka and calculating ducting size and Flow rates. however, the issue is that the kitchen is covered area outside with many open spots to the dining area which is an unwalled sitting area (with a roof but fully open-top elements). I would just like some guidance of where to look for information on how this open setup will effect total airflow calculations as I cant seem to find much test case data online?

we are guessing it will be a lot of test and adjust but we would like to predict the required fan and ducting size as much as possible to reduce the amount or redoing after.

Any idea on where to get some information on this?

Many thanks!