[wwest]

You can have moderately less restriction to air outflow from the system, more outflow volume, by simply removing the firewall distribution "bowtie".

Generally you only need "directed" airflow during the initial cabin atmosphere cooldown period.

Beyond that "directed" airflow can be discomforting so most of us would re-direct the coolish airflow away from our face and upper body.

Unless you have a system with sub-standard cooling performance which most certainly should not be the case with even 1/3 of the Griffiths kit installed. Most functional 1/3, of course.