Hello, I would like to ask you what fans should I put at the top of my case. I was thinking about putting 2 x Noctua NF-A15 HS-PWM 140mm as exhaust at the top. Would it be better if I put them as intake? Is there a better fan than Noctua NF-A15 HS-PWM 140mm top case fan? ( And cost less than 50 euros/dollars). My PC Case is a Phanteks P600S, and there are 3 140mm fans in front as intake, and 1 exhaust fan in the back of the case, those 4 fans came with the case. I'm also using a Noctua NH-D15 CPU cooler. Thanks for your help and advice in advance.