Oh they are the best for circulating air.. i love it.I believe you want your clones to be about 6 inches or so when you stick them into whatever medium you are using for the clones. You might be able to make some smaller clones but its probably not recommended. We took our first clones a couple of weeks ago so I just remember what I have read...and ours are doing o.k. so far...but our mommas were larger than what you have there.
Don't those 5 dollar fans from wally world rule? They have even better ones for 10 bucks though...