Wireless Access

We had a wireless assesmment and are getting 8 new Aruba 315's installed this week, replacing the 215s we have now. These are all instant access points. 

Will the new Access points get the configuration from the existing ones, and when we turn off the old APS will one of the new ones become the master (we will be removing the old access points at the end) ?

Also one of the recommendations was "Suggest turning off 2.4 and adjusting channel width to 20" 

I can not figure out how to adjust the channel width. 

Are these Instant APs or Controller-based?  The answers will differ based on the answer to that question.

See the following screenshots for turning the 5Ghz down to use only 20Mhz channels. IAP and Controller Based.

I dont seem to have a profile section. 

You were probably looking at the controller based config. See the IAP screenshot below or attached.

You will have to click the "show advanced options" button on the bottom to show them. 

I did click on the show advanced. I see the RF section for the 5 GHz, should I also see something for channel width of 20 ?

Turning off wide channel bands should get you down to 20Mhz.

This is Instant