I have a fully insulated,independant grow room that is 4X8X8-could someone give me an idea of the size of fans I need for intake and exhaust.I am using T5- 4 foot doubles one per side and one overhaed-and my temps are up around 90 to 100.My present fans are just two-4" and arent really working.Any input would be really helpfull-the plus side my plants are in crazy bloom-3rd week.