Intake, extract , circulation fans minimum requirements

I would like to know what is the minimum requirement I would need in a 4x2x5 tent with led EB strips for lighting say around 400 watts. I would like to keep the number of fans down to a minimum if at all possible. What is more important can I get away with only one or two or do I need all 3? Can the intake fan double as the circulation fan? I live in Australia so temps maybe an issue in the tent with average daily temp around 30 degrees Celsius. Thanks for the replies

4x2 tent, you only need an extraction fan with passive intake and as much circulation fans as you see fit. But you do need one circulating air. You can use multiple pc fans for circulation if you want to be quiet.
It depends on why you want less fans. Most fans are low wattage, but the loudest fan will be the one you hear if its noise that's the issue.

coreywebster said:

4x2 tent, you only need an extraction fan with passive intake and as much circulation fans as you see fit. But you do need one circulating air. You can use multiple pc fans for circulation if you want to be quiet.
It depends on why you want less fans. Most fans are low wattage, but the loudest fan will be the one you hear if its noise that's the issue.

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Thank you for your reply, noise will not be an issue. I will get an extraction fan and one for circulation ... cheers

One question any recommendation for a good "quite" inline duct fan buying for Amazon would be my best bet? 4 or 6 inch for the size of my tent 4x2x5 ... cheers

I've been running a Hurricane 6" 435cfm fan nonstop for over a year. Overkill for my 3x3 but it does the job great. So great that I recently added an additional 6' of ducting and my 2x2 veg area to its workload. Vents both areas like a champ at half speed!