Odor and Airflow Questions?

I have been reading a number of posts, old and new, on odor control and ventilation. Some of the information has been fantastic while other posts have been a bit off and potentially misleading. Knowing that each and every grower does things a little different and that no two set ups are the same; What questions do you feel need answering? How carbon works? How to calculate for desired air flow? How long will a filter last? Or??

Let me know and I will try to help…
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