User's Manual

Fat Channel Intolerant This setting communicates to surrounding networks
that this WiFi adapter is not tolerant of 40MHz
channels in the 2.4GHz band. The default setting is
for this to be turned off (disabled), so that the
adapter does not send this notification.
NOTE: This setting is does not apply to the
following adapters:
Intel(R) Wireless WiFi Link 4965AG_
Intel(R) PRO/Wireless 3945ABG Network
Connection