can i plug a 2 pin fan into a 4 pin header?

[diven nuttall]

tilte says it all

 

[Gttrz97]

Yes you can but you won't be able to control RPM of the fan thus making it uncontrollable.

 

[diven nuttall]

should where should i put my fans in the case should i put 2 at the bottom or just one at the intake and leave the pcie brackets off or just put a fan under the gpu. https://docs.google.com/drawings/d/1wCL0jZdkbazGdPVCVX1Sa2WsSZY8FAo1hPc9VA3XNyg/edit