Fans are a must. Last summer had early season rains with night time temps in the low 60's and near 100 humidity without a large oscillating fan running on high inside hoop house my plants would have molded for certain! Invest in good fans, the more the better! I'm running in a 4x4 tent with 4 fans, one inline fan with a speed controller that draws air through a carbon filter that pulls air in through all of the lower vents that are screened air is then pushed into the main room out of the tent. One 10 inch oscillating fan that I runs when lights are on just high enough to rustle the leaves slightly. I have another non oscillating 10 inch fan on the floor that I point up that forces the cooler air up through the plants further circulating the air. And one last clip fan that I pointed towards the dead air space below the oscillating fan. All fans run 24/7 with exception of the oscillating one. Most grow fans I've seen aren't worth the money they want. Look on Amazon for Honeywells. Great fans and use light wattage. Hope this helps!
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