Oh... I didn't consider that Samuel might be trying to figure out how many 5Ghz APs he needs to support a certain number of "video" clients.
Samuel:
Are you aware of how many non-overlapping 40Mhz channels there are in the 5Ghz band?
I think it's 12.
https://en.wikipedia.org/wiki/List_of_WLAN_channelsHow many clients do you need to support?
Would 12 channels be enough for your application?
(or 15, if you're allowed to use the 3 2.4Ghz 20Mhz channels and consume "all" spectrum for this one purpose)