[build help] Are EK-Vardar fans good as case fans?

I know that the EK-Vardar fans are specifically designed for radiators but can they also function fine just as case fans? I'm looking at buying the HD 7950 Cu adapter on ekwb.com but it's only a couple bucks and unfortunately I need a minimum purchase. The problem is it's a hardcore water cooling site so I don't really have use for anything on there -- unless these fans are also useful as case fans because I was looking to pick two up anyways. So, do any of these fans qualify for use as a case fan? They are all EK Vardar

EK- F1, F2, F3, F4, FF5 (120)

EK Fan (180)

Here's a link to the page. https://shop.ekwb.com/radiators-fans?p=2