We're the second owners of a home built in 2015, and a HVAC technician recently pointed out that our basement furnace piping uses long runs of flex pipe, where hardpipe should have been laid. He said that airflow can become turbulent in these and will be improved with hard piping.
Looking to confirm this information. My residence is a 2200sqft + finished basement with a decent furnace system. Is the air flow in such a residence typically fast enough such that runs of flex piping would disrupt airflow? I have noticed that vents in the first floor that attach to these do feel weaker than the ones in the second floor of my house and thought maybe this was the reason.