can i use different fans for push/pull configuration??

[R0nie]

can i use fans with different CFM for push/pull config.???i have three types of fans(all 140mm) ----
67 CFM | 50 CFM | 57 CFM .as this number varies only a little can i use any of them??and if i can which one will give me the best result??i mean which type to use as push and which one as pull??

 

[BBrent]

You can use two speeds of fans. It won't be a problem. I would recommend the faster fan to be pushing. Which will reduce dust build up.

 

[madmatt30]

I'd use 57 push / 67 pull - you'll lose a bit of pressure with the one pulling so they'll be close enough matched IMO.
Reading bbrents which suggests the other way I honestly don't think there will be much if a difference in either configuration - best way is to just try them