Hi mate, like you I grow in a small space. (0.7 x 0.7 x 1.6) x 60 =47.04m3, thats how much air you need to move every min. Look at the rating of your fan and as long as it is about that figure you will be fine. You have to take into account you filter and any other air restriction. I have a 100mm hole feeding my fan. My fan is rated for 160m3/hr and it is @ 75%. I move more air than needed but nothing wrong with that. My filter is rated for 350m3/hr so as not to restrict too much.
I hope this helps, good luck and happy growing