I will say no, but it depends of what you reckon as a safe temperatures, some wants all parts to be below 50C other let GPU heat up to 90. We can debate a weak about it and make a false assumptions. If your room temp is 25-30C then the temperatures inside the case will be totally different than at 20C. Thus i wont give u simple and definite yes/no coz that would be like forecasting the weather.
From the article I've sent you can clearly see the hottest part in the case is GPU which in the testing environment had 56C over ambient, add worst scenario in the summer (+30) and you have 86C. That numbers doesn't look good, but also note that this ain't much different from the rest of the shown cases... conclusion the case cooling is far less important than specified component cooling!
So if you want to have nice and cool PC, buy properly cooled GPU and good CPU cooler.... but hey, you have choose them correctly, so now the only way to test it will work fine is just to get it and heat it up with some long time gaming... when you will measure the temps and GPU or CPU is above 70.... you might want to think about some corrections, when beyond 80 you are definitely going to change something.