marson wrote:

where I'm from, Duluth, MN, the airspace is required by code.

IIRC, ERVs are also code, and a big waste of money.

I think it is important to use a chute the entire length, not only because
it ensures airflow, but it also reduces "windwash" which strips heat away
from your insulation.

"Chutes" encourage "windwash," no? I suggest that you
ignore the code and take control of your own life.

Nick