I want to use the Air Canada Maple Leaf Lounge at Terminal 2. My next flight leaves at Terminal 7. I will not need to re-check bags.

Should I clear security at terminal 5 or 6 and take the Tunnels to terminal 7? Or just go right to security at terminal 7?

Are the tunnels within security or outside of security?

Will security at terminals 5/6 let me clear myself through their security lines if I have a ticket for terminal 7?

I'm just trying to think of the fastest way to do this and how much time I need to give myself.