Question Can I use 2x 140mm fans at top and 1x 120mm fan at back?

[testies789]

Case: Corsair CC-9011139-WW 500D Obsidian RGB SE Mid Tower

Can I use 2x 140mm fans at top and 1x 120mm fan at back?

I have 3x 120mm intake fans at the front.

So my question is, is it ok to use different size fans at the top and back or will this effect the airflow in a bad way?

 

[Eximo]

It will be fine.