How much CFM for a 4x4x6 veg tent?

That’s how I role pretty much.

passive vents but with a thermostat controller that holds a desired temp by speeding up or slowing down but I don’t use an AC as I live in the U.K.

During winter months I block off some of my intakes if temps get too low.
Is AC standard in most apartments and homes in UK or rare? Never heard this before. Honestly the world didnt exist before AC did it?
 
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