Your pics help. What components do you have and what case?
My experience with pancake coolers is they usually cool better with fan pulling air out of cooler instead of pushing in. Pushing in means heated air hits mobo and turns out, than hits RAM, GPU, I/O housings and turns up alongside cooler, and as it goes past cooler fan is sucked back into fan and cooler. Pulling out means cool air flows over motherboard (cooling components) into cooler, up through fan, and than can be drawn out of case. If side cover fan is over CPU make it an exhaust.
Hardest part of build is getting proper airflow in case.. airflow that keeps heated cooler exhaust air from mixing with cool air coming into case.
Some of my build use no exhaust fans.. only good cooler fans for intakes.. and usually all case fans are PWM on PWM splitter using CPU fan header for PWM signal and powered by molex or sata from PSU. Case fans idle when CPU idles and ramp up as CPU does.
Originally Posted by wizardonthejob
In order to have proper case flow and good static pressure (helps keep dust down), you want more intake flow than exhaust. So you have to take CFM into account. Find out how much air is going into your case per minute, then find out which fans you need to add/turn around in order to give you static pressure.
So, get the CFM (cubic feet per minute) for each fan and total them by direction (in or out). Then make sure your out is less than your in.
Figure this out first, so you can then decide what other fans you may ( or may not) need.
As for wiring, if it fits, plug it in. Fans draw such little power you dont have to worry about it (unless you're using Delta fans that spin at a rediculous rate).
Good rule of thumb is you need twice the CFM rating of intake ans exhaust. Intake usually has way more airflow resistance than exhaust.
As for adding splitter and extra fans to mobo be careful. Most fan headers are rated about 1a (12w) maximum load. Most fans running less than 1200-1300rpm use 2-3w, but those that run faster use much more power.. usually 5-7w; Thermalright TY-143 is 7.2w; Scythe Typhoon, Ultra Kaza & Slip Stream are 3- 7.2w depending on rpm range; etc.