Basics of ventilation - what do I need?

If the air inlet is passive, the total area must be greater than the diameter of the hood so that the flow is not choked.

If the negative pressure is correct, the tent pulls slightly inwards. That is a good indicator that the system is working.

@airflow_lab

At least: hood + carbon filter + 1-2 clip fans. Constant air movement reduces the risk of fungus.