Odd, looks like Canada allows the same channels the US does for 5Ghz use, as long as the system supports DFS. My US based 802.11ac and 802.11n Apple Airport equipment supports and has used these channels. I discovered this when my now ancient 802.11g Airport Express dropped off the network one day until I forced a channel change.

Not sure what you'd look for specifically to know if it has this ability, since 802.11h was rolled into the main 802.11 spec in 2007. Apple's own page about the issue doesn't mention any specific sign to look for beyond clients not being able to see the network.