Advice needed on Airfow (Exhaust,Extraction)

My growroom size is 3.75ft x 1.3ft x 2.4ft.
As this is such a small space i only intend to grow a couple of plants. I have a 100w Sodium light and was wondering how much the heat will be a problem?
I am going to use an exhaust fan that shifts 60cfm and am wondering if this is good enough?
Also I am going to use a 12cm pc fan to force air into my growroom(closet). Would a 80mm pc fan be enough?
Any advice is welcome.

that'll do it...if you use a small oscillating fan then you won't have any problems for sure....

3.75 X 1.3 X 2.4 = 11.7 Cubic Feet

60 CFM > 11.7 CF

Tadah!!!

You definatly won't need a intake fan, just cut a hole and light proof it. With a 60CFM fan for a 11 CF area you will get a ton of draw in from the hole. The fan will create negative pressure inside your box drawing air in through any hole or unsealed cracks or corners.