Of Course fresh air from outside set up through a venting system would be ideal but many of us dont have the luxury of this kind of set up due to location of growing within the house and or drilling duct holes through the roof or side of the house. Just make sure that you have a fan circulating air around the ladies 24/7. I put a fan parallel with my HPS to reduce the heat coming down because I dont have a cool tube so it serves 2 purposes keeping heat down as well as circulating air and my grows have been great. Of course you mentioned your in a hut so the heat might be more a factor where as I have a more open space so at any rate just make sure you have a fan going in the hut.

Peace