air circulation

Hey guys. I ordered a fan and ducting but it won't be here for a week. In the meantime, my humidity shoots up to 90 every night when I shut the tent up. I know it's really bad to have no airflow but I was wondering if there's anything I can do while waiting waiting for my stuff to arrive. All...

So I have a 4x4 grow tent with two 600watt LED lights...my tent is in a shed on my property..my question is..would I need to get inline fans or could I manage with booster fans? Also, what size would be best...4in or 6in....I'd rather not pay the 69 x 2 if I can do the same with a few $21...