Well Soar, Corsair recommends intake. I found temp 1 to 2 deg higher when set to intake. I have also mounted a fan opposite the 1st intake fan of H70 ,as intake, which sucks in cold air and passes it to H70. Also another fan,mounted at front top blows in. In all I have 4 intakes and 2 exhaust in the case. This is to create a positive pressure in and keep the dust out.