The Apevia X-Plorer is a normal case: 120mm fan in, 120mm fan out. Bonus: it has a 200mm side fan. Double bonus: it has a 4-slot 5.25" bay.
Move your DVD player to the bottom slot and see if you have room for a 140mm fan in the top 3 slots + 10mm at the top. If you do, install a 140mm intake fan there, as in item 11 in my sig. Otherwise, put a 120mm intake fan there.
Remove all of your rear slot covers. This will free up airflow from your graphics card, which spews air in all directions.
If you like modding you can remove your rear grill and the metal strips between your PCIE slots. You won't need a rear exhaust fan and the air will freely leave your case.
In any . . . case . . . you're fine.