I am hearing that the builders are putting the homes so tightly together on these zero lot line homes that the city requires these type vents instead of soffit vents. This is a 10 month old home and the vents are rucked really bad. They seem to be performing their function.
As I understand it. (not really certain but a client told me this one) Some cities that have the zero lot line homes as this one did, do not allow soffit vents on the sides where the home is one boundary to the yard. Something to do with for instance BBQ smoke venting into the attic space. That sort of thing. But then I see this on other homes that are not zero lot line.