Do i need an exhaust fan

[fishmon]

I'm starting a home-made tent I'm just wondering what the cfm I need is would it be 100? Or is that to much minus ducting and everything the temp stays around 73-77 and humidity stays at 64-68
I'm just wondering do I have to buy the ducting ect or can I just get an exhaust fan and be fine?
The tent is like 2.5x2.5x7 or 8 feet

I'm starting a home-made tent I'm just wondering what the cfm I need is would it be 100? Or is that to much minus ducting and everything the temp stays around 73-77 and humidity stays at 64-68
I'm just wondering do I have to buy the ducting ect or can I just get an exhaust fan and be fine?
The tent is like 2.5x2.5x7 or 8 feet

As stated by others, the air in a closed tent should be replaced by fresh air every 3-5 minutes. 2.5x2.5x7 ft = 43.75 cu ft. A 4" ac infinity (around $55) is rated at max 165 cu ft/min. It's a 10 speed fan so it would easily satisfy your requirements even at 1/2 speed. Ducting and filter would reduce that capacity somewhat but still has more than adequate capacity. There are some online calculators I think one is by mars hydro that account for duct, filter, etc. The 4" would satisfy your needs.