im guessing your wifi device using
http://support.lenovo.com/en_US/deta...cID=migr-55029
apparently it's a intel 2200 or the like
RHEL is the same as CentOS (indeed, CentOS is a clone of RHEL), so if you cannot find info on the RHEL support site, may be this can help you:
http://wiki.centos.org/HowTos/Laptops/Wireless
you can identify your devices using the lspci command
if you need more info, just tell me here
Best Regards