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I think you are wanting to do what I have done -I have a window setup so I cant mount a fan on the side so I stuck a fan at the top (via velcro patch on the psu bracket) which sucks cold air into the case and the cpu fans and case fan send air out of the case. The case fan is a slim 92mm, cpu fans are regular 92 mm and the top fan is 80mm. 92mm at the top would not fit because theres 2 notches in the way.
I think you are wanting to do what I have done -
I have a window setup so I cant mount a fan on the side so I stuck a fan at the top (via velcro patch on the psu bracket) which sucks cold air into the case and the cpu fans and case fan send air out of the case. The case fan is a slim 92mm, cpu fans are regular 92 mm and the top fan is 80mm. 92mm at the top would not fit because theres 2 notches in the way.