Weird (to me) state of iwlwifi 11a

Hello,

After watching bz@ talk at this years EuroBSDCon, I learned that iwlwifi 
supports 11a, but only on newer chipsets. My laptop connects only to 
11ng, but here's the weird thing: I see at least one WiFi network on 
channel 36 through "ifconfig wlan0 scan". I thought that 11a is required 
to see channel 36, but as a total WiFi noob, I might be totally wrong. 
Anyway, my question is how to check if my iwlwifi is new enough and why 
do I see network on channel 36? Thank you!

Regards,
meka