Originally Posted by
Xandrios
I'd expect the first 3 rows only to be used for this purpose on aircraft where boarding is from the rear?
I believe it's more to do with where the air is removed from the cabin.
I read somewhere in the last week or so that on planes where the air circulation was from front to back, with the air being "sucked" out of the cabin at the back, then the final 3 rows were kept clear for "isolation" purposes, the idea being you don't want any particles from the isolated passenger to have to travel the entire length of the passenger cabin.