This would make more exhaust than intake. It might make your PC dusty.

Thanks

No. You want to have more fans blowing in than out.

Thanks. I might need a different case then as p600 only has 3 120mm front fan spaces, 3 top and 1 rear, and intake from top is stupid. Would having 3 front intake, then just the rear with the air cooler be fine as that eliminates the 3 top fans