2 separate network AP’s interference?

Cross Posted in smaller sub r/wirelessNetworking

Hello everyone. I am working on a building renovation. Some of the non-IT management are asking for a simple explanation about our 2 separate networks. The issue is: we have one Network that goes to the outside world and other facilities internet etc. We have another network that is totally contained inside the building for security reasons (Lab) The building renovation will need separate AP’s for each network. There is no survey in place. I am trying to explain to them in layman’s terms why we need to try to separate these AP’s and worry about channel overlapping etc. They will have 2 different wireless controllers, different switches etc.

What is the best way to explain how we need to set these up so the non-it management can understand it?

Thanks for any help you can provide.